---METADATA---
VENDOR: Dell
PRODUCT: Virtual Storage Integrator for VMware vSphere Client
AFFECTED_VERSIONS: Prior to 10.11.1.0
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
An OS command injection vulnerability exists in the Dell Virtual Storage Integrator for VMware vSphere Client, allowing unauthenticated remote attackers to execute arbitrary code as root.

Executive Summary:
A critical OS command injection flaw in Dell Virtual Storage Integrator allows unauthenticated remote attackers to execute arbitrary commands with root privileges, leading to full system compromise.

Vulnerability Details

CVE-ID: CVE-2026-67261

Affected Software: Dell Virtual Storage Integrator for VMware vSphere Client

Affected Versions: Prior to 10.11.1.0

Vulnerability: The vulnerability exists within the IAPI component, which fails to properly sanitize input, enabling OS command injection by an unauthenticated attacker.

Business Impact

A successful exploit provides the attacker with root-level access to the underlying operating system. This leads to a complete compromise of the Virtual Storage Integrator deployment, potentially impacting the confidentiality, integrity, and availability of managed storage environments and infrastructure.

Remediation Plan

Immediate Action: Upgrade the Dell Virtual Storage Integrator for VMware vSphere Client to version 10.11.1.0 or later as recommended by the vendor.

Proactive Monitoring: Review system logs for suspicious process execution or unauthorized modifications to system files originating from the VSI component.

Compensating Controls: Use network-level access controls to restrict access to the VSI management interface to authorized administrative IP addresses only.

Exploitation Status

Public Exploit Available: No

Analyst Notes: As of August 6, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The requirement for root-level execution makes this a high-priority target for threat actors.

Analyst Recommendation

Due to the critical nature of remote code execution with root privileges, organizations should treat this update as an emergency deployment. Immediate patching is necessary to prevent total system takeover.

---METADATA---
VENDOR: VMware
PRODUCT: Cloud Foundation, vCenter, vSphere Foundation, Telco Cloud Infrastructure, Telco Cloud Platform
AFFECTED_VERSIONS: VMware Cloud Foundation: 9.1.x.x, 9.0.x.x, 5.x; VMware vSphere Foundation: 9.1.x.x, 9.0.x.x; VMware vCenter: 9.1.x.x up to 9.1.0.0300, 9.0.x.x up to 9.0.2.0100, 8.0 up to 8.0 U3k; VMware Telco Cloud Infrastructure: 3.0; VMware Telco Cloud Platform: 5.1.x, 5.0.x, 4.x, 3.0
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware vCenter contains a directory traversal vulnerability in the Syslog server, which may allow an unauthenticated attacker with network access to execute arbitrary code on the system.

Executive Summary:
A critical directory traversal vulnerability in the VMware vCenter Syslog server allows unauthenticated remote attackers to achieve arbitrary code execution.

Vulnerability Details

CVE-ID: CVE-2026-59310

Affected Software: VMware Cloud Foundation, vSphere Foundation, vCenter, Telco Cloud Infrastructure, and Telco Cloud Platform

Affected Versions: See metadata for specific version ranges.

Vulnerability: This is a directory traversal vulnerability (CWE-22) located in the Syslog server component. An unauthenticated attacker can leverage this flaw to access restricted directories and execute arbitrary code, compromising the underlying host.

Business Impact

The ability for an unauthenticated attacker to execute code remotely carries a CVSS score of 9.8, indicating a critical risk of total system takeover. This could result in complete loss of control over the virtual infrastructure, data theft, or the installation of persistent malicious backdoors.

Remediation Plan

Immediate Action: Upgrade all affected VMware components to the latest versions as specified in the official Broadcom security advisory.

Proactive Monitoring: Inspect Syslog server logs for path traversal patterns, such as sequences including dot-dot-slash, and monitor for unexpected process execution on the vCenter appliance.

Compensating Controls: Deploy a Web Application Firewall or network intrusion detection system to filter malicious payloads targeting the Syslog server interface.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 30, 2026, there is no public information indicating active exploitation or a public proof of concept for this vulnerability. The flaw's potential for remote code execution makes it a high-priority target for threat actors.

Analyst Recommendation

Given the critical severity and the potential for remote code execution, organizations must treat this vulnerability with the highest priority. Patching is the only effective way to remove the underlying defect and prevent potential exploitation.

---METADATA---
VENDOR: VMware
PRODUCT: Cloud Foundation, vCenter, vSphere Foundation, Telco Cloud Infrastructure, Telco Cloud Platform
AFFECTED_VERSIONS: VMware Cloud Foundation: 9.1.x.x, 9.0.x.x, 5.x; VMware vSphere Foundation: 9.1.x.x, 9.0.x.x; VMware vCenter: 9.1.x.x up to 9.1.0.0300, 9.0.x.x up to 9.0.2.0100, 8.0 up to 8.0 U3k; VMware Telco Cloud Infrastructure: 3.0; VMware Telco Cloud Platform: 5.1.x, 5.0.x, 4.x, 3.0
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware vCenter contains an authentication bypass vulnerability in the VMware Directory Service, allowing unauthenticated attackers with network access to gain unauthorized system access.

Executive Summary:
An authentication bypass vulnerability in the VMware Directory Service allows unauthenticated remote attackers to gain full system access, presenting a critical security risk.

Vulnerability Details

CVE-ID: CVE-2026-59309

Affected Software: VMware Cloud Foundation, vSphere Foundation, vCenter, Telco Cloud Infrastructure, and Telco Cloud Platform

Affected Versions: See metadata for specific version ranges.

Vulnerability: This is an authentication bypass flaw (CWE-303) within the VMware Directory Service. The vulnerability allows an attacker with network access to vCenter to bypass authentication mechanisms entirely, requiring no prior user credentials.

Business Impact

A successful exploit grants an attacker unauthorized access to the vCenter environment, which typically manages the entire virtual infrastructure. Given the CVSS score of 9.8, this vulnerability poses a total risk to confidentiality, integrity, and availability, potentially leading to full administrative control over virtual machines, data exfiltration, and significant operational disruption.

Remediation Plan

Immediate Action: Apply the vendor-supplied updates immediately by upgrading to the patched versions specified in the Broadcom support advisory.

Proactive Monitoring: Monitor network traffic for unusual authentication requests to the VMware Directory Service and review vCenter access logs for unauthorized administrative activity.

Compensating Controls: Restrict network access to the vCenter management interface to trusted management networks only, utilizing firewall rules to block unauthorized external access.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 30, 2026, there is no public information indicating active exploitation or a public proof of concept for this vulnerability. The flaw is highly dangerous due to its network-accessible and unauthenticated nature.

Analyst Recommendation

This vulnerability is critical and requires immediate attention due to the ease of exploitation and the potential for total system compromise. Organizations must prioritize patching their VMware environments to the latest versions defined in the vendor advisory to mitigate this high-severity risk.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is vulnerable to directory traversal, which may allow an authenticated user to access sensitive files outside of the intended directory structure.

Executive Summary:
A directory traversal vulnerability in VMware Avi Load Balancer could allow an authenticated attacker to read or modify sensitive files on the host system.

Vulnerability Details

CVE-ID: CVE-2026-47871

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This is a directory traversal vulnerability (CWE-22) that allows an authenticated user to bypass path restrictions. The CVSS vector indicates that the attack is network-exploitable and requires only low privileges.

Business Impact

With a CVSS score of 8.8, this high-severity vulnerability presents a critical threat to the confidentiality and integrity of the load balancer environment. An attacker could potentially extract sensitive configuration files, credentials, or system data, leading to a broader compromise of the network architecture managed by the load balancer.

Remediation Plan

Immediate Action: Apply the vendor-supplied security updates immediately to resolve the directory traversal flaw.

Proactive Monitoring: Inspect web application firewall (WAF) and server access logs for suspicious path traversal sequences, such as dot-dot-slash patterns.

Compensating Controls: Implement strict file system permissions and ensure the application process runs with the minimum necessary privileges to limit the impact of potential directory access.

Exploitation Status

Public Exploit Available: No

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. While the vulnerability requires authentication, the high CVSS score reflects the significant risk posed by unauthorized file system access.

Analyst Recommendation

The high CVSS score and the nature of directory traversal vulnerabilities necessitate prompt remediation. Administrators should verify that all instances of the Avi Load Balancer are updated to the secure version to prevent potential unauthorized data exfiltration.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is subject to a privilege escalation vulnerability that allows authenticated users to gain unauthorized access to sensitive functions.

Executive Summary:
A privilege escalation vulnerability in VMware Avi Load Balancer could permit an authenticated attacker to elevate their privileges and access restricted system features.

Vulnerability Details

CVE-ID: CVE-2026-47870

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This flaw is classified as CWE-269 (Improper Privilege Management). It is exploitable over the network by an authenticated user with low privileges, allowing for unauthorized escalation of access rights.

Business Impact

The vulnerability carries a CVSS score of 7.1, indicating a high risk of unauthorized administrative actions. Successful exploitation could allow a malicious actor to manipulate system configurations or disrupt services, resulting in potential service downtime and the compromise of traffic management policies.

Remediation Plan

Immediate Action: Update the VMware Avi Load Balancer to the latest version as specified in the vendor security advisory.

Proactive Monitoring: Monitor logs for unauthorized administrative activity or unexpected changes to system policies performed by non-administrative accounts.

Compensating Controls: Utilize role-based access control (RBAC) to ensure that users are restricted to the absolute minimum permissions required for their specific job functions.

Exploitation Status

Public Exploit Available: No

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The requirement for prior authentication acts as a deterrent, but the ability to escalate privileges remotely remains a significant security concern.

Analyst Recommendation

Given the potential for privilege escalation, organizations should prioritize updating their systems to the patched version. Ensuring that access controls are rigorously maintained will provide additional protection against this and similar privilege-related vulnerabilities.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: patch
---END_METADATA---

Description Summary:
VMware Avi Load Balancer contains a remote code execution vulnerability that allows an authenticated attacker with high privileges to inject and execute arbitrary code.

Executive Summary:
A remote code execution vulnerability in VMware Avi Load Balancer allows high-privileged attackers to achieve system-level code execution.

Vulnerability Details

CVE-ID: CVE-2026-47869

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This is a code injection vulnerability (CWE-94) that enables remote code execution. The vulnerability is restricted to users who have already gained high-privileged access to the administrative interface of the load balancer.

Business Impact

Successful exploitation allows an attacker to execute arbitrary code with elevated privileges on the Avi Load Balancer. This could lead to a complete compromise of the load balancer, enabling the attacker to intercept or manipulate network traffic, bypass security controls, and gain deeper access to the organization's internal infrastructure. The CVSS score of 8.7 underscores the critical nature of this vulnerability.

Remediation Plan

Immediate Action: Apply the latest security patches provided by the vendor to all affected Avi Load Balancer instances.

Proactive Monitoring: Audit administrative logs for suspicious configuration changes or unauthorized command execution events.

Compensating Controls: Enforce strict access control policies on the management interface, ensuring that only trusted administrators can access the console.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. Despite the requirement for high privileges, the potential for total system compromise makes this a high-priority update.

Analyst Recommendation

Security teams must treat this vulnerability with high urgency. Patching the Avi Load Balancer is essential to prevent potential code injection attacks, and organizations should review their administrative access policies to ensure that only necessary personnel have the privileges required to reach the vulnerable management functions.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is affected by a local privilege escalation vulnerability due to improper privilege management.

Executive Summary:
A local privilege escalation vulnerability in VMware Avi Load Balancer could allow an authenticated attacker with low privileges to gain unauthorized elevated system access.

Vulnerability Details

CVE-ID: CVE-2026-47868

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This is a local privilege escalation flaw categorized under CWE-269 (Improper Privilege Management). The vulnerability requires the attacker to be authenticated with low-level privileges to successfully execute the attack.

Business Impact

Successful exploitation of this vulnerability permits an authenticated, lower-privileged user to escalate their permissions, potentially gaining full administrative control over the affected load balancer instance. With a CVSS score of 7.8, the vulnerability poses a high risk to organizational security, as it could lead to total system compromise, unauthorized data access, and a significant breach of internal network segmentation.

Remediation Plan

Immediate Action: Upgrade the VMware Avi Load Balancer software to the latest patched version provided by Broadcom support.

Proactive Monitoring: Review system access logs for unusual command execution patterns or unauthorized attempts to modify user group memberships.

Compensating Controls: Strictly enforce the principle of least privilege by auditing existing user accounts and restricting access to only those individuals who require it for operational duties.

Exploitation Status

Public Exploit Available: No

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The flaw requires prior local access, which significantly narrows the attack surface compared to remote vulnerabilities.

Analyst Recommendation

Organizations should prioritize patching this vulnerability to prevent malicious actors from leveraging compromised low-privilege accounts to gain elevated access. Patching should be performed in accordance with standard change management procedures to ensure ongoing system stability.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: patch
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is vulnerable to a remote code execution flaw that allows an authenticated attacker with high privileges to inject and execute arbitrary code.

Executive Summary:
A critical remote code execution vulnerability in VMware Avi Load Balancer allows high-privileged attackers to gain control over the system.

Vulnerability Details

CVE-ID: CVE-2026-47867

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This is a code injection vulnerability (CWE-94) that permits remote code execution. The vulnerability requires the attacker to possess high privileges, meaning the attacker must already be authenticated to the administrative interface to perform the attack.

Business Impact

An attacker who successfully exploits this vulnerability can achieve remote code execution, granting them full control over the load balancer. Given the critical position of load balancers in network architecture, this access could lead to total compromise of traffic, data interception, and lateral movement into the backend network. The CVSS score of 8.7 reflects the severe impact on system integrity and confidentiality.

Remediation Plan

Immediate Action: Apply the vendor-provided security patches immediately, prioritizing systems that are internet-facing.

Proactive Monitoring: Monitor management interface access logs for unauthorized administrative activity or unusual command execution patterns.

Compensating Controls: Restrict access to the management console of the Avi Load Balancer to specific, secure jump hosts or VPN-only access to prevent unauthorized administrative login.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. While exploitation requires high privileges, the ability to execute arbitrary code makes this a top-tier security concern.

Analyst Recommendation

The severity of this remote code execution vulnerability necessitates immediate remediation. Administrative teams should ensure that all instances of the Avi Load Balancer are updated to a secure version and verify that administrative access is restricted to authorized personnel only to minimize the risk of exploitation.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is affected by an authorization bypass vulnerability that allows authenticated users to perform unauthorized actions.

Executive Summary:
An authorization bypass vulnerability in VMware Avi Load Balancer could allow an authenticated attacker to compromise system integrity and confidentiality.

Vulnerability Details

CVE-ID: CVE-2026-47866

Affected Software: VMware Avi Load Balancer

Affected Versions: 32.1.1, 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7

Vulnerability: This is an authorization bypass flaw (CWE-863) that allows an authenticated user to perform actions beyond their assigned privileges. The attack requires low privileges and can be executed over the network.

Business Impact

Successful exploitation of this vulnerability can lead to unauthorized access to sensitive load balancer configurations and traffic data. With a CVSS score of 8.3, this high-severity flaw poses a significant risk to operational security, potentially resulting in data exfiltration or service disruption.

Remediation Plan

Immediate Action: Review the official Broadcom security advisory and apply the recommended patches for your specific version of the Avi Load Balancer.

Proactive Monitoring: Monitor system access logs for unusual administrative activity or unauthorized attempts to access restricted load balancer functions.

Compensating Controls: Implement strict network segmentation and restrict administrative access to the management interface to trusted IP addresses only.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 19, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The flaw's reliance on authenticated access limits the initial attack surface, but the potential for privilege escalation remains a serious concern for enterprise environments.

Analyst Recommendation

Given the high CVSS score and the critical role of load balancers in network infrastructure, immediate patching is essential. Security teams should prioritize identifying affected instances and scheduling maintenance windows to apply the necessary vendor updates to prevent potential unauthorized access.

---METADATA---
VENDOR: VMware
PRODUCT: Avi Load Balancer
AFFECTED_VERSIONS: 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 22.1.7
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Avi Load Balancer is vulnerable to an authentication bypass, allowing unauthenticated attackers with network access to compromise the Avi Control plane.

Executive Summary:
A critical authentication bypass vulnerability in VMware Avi Load Balancer enables unauthenticated attackers to gain unauthorized access to the control plane, posing a severe risk to infrastructure.

Vulnerability Details

CVE-ID: CVE-2026-47865

Affected Software: VMware Avi Load Balancer

Affected Versions: 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, 22.1.1 through 30.2.7 (patch dependent)

Vulnerability: The vulnerability is an improper authentication flaw (CWE-287) in the Avi Control plane. The flaw allows an unauthenticated remote attacker to bypass authentication mechanisms entirely, granting full control over the load balancer.

Business Impact

Successful exploitation allows an attacker to gain unauthorized administrative access to the load balancer, which serves as a central point for managing network traffic. This could lead to full system compromise, interception or manipulation of sensitive traffic, and significant service disruption. Given the CVSS score of 9.8, this vulnerability is classified as critical and requires immediate attention to prevent unauthorized administrative control.

Remediation Plan

Immediate Action: Upgrade to the patched versions as specified by the vendor: 31.2.2-2p3 for the 31.x branch, or 30.2.7 for the 30.x and 22.x branches.

Proactive Monitoring: Monitor management interface access logs for unauthorized login attempts or unusual patterns originating from unexpected IP addresses.

Compensating Controls: Restrict network access to the Avi Control plane interface to trusted management subnets using network firewalls or ACLs until patching can be completed.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of July 18, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The flaw is inherently dangerous due to its unauthenticated remote nature.

Analyst Recommendation

This vulnerability represents a critical risk to the availability and integrity of your network infrastructure. Administrators should prioritize patching the Avi Load Balancer immediately and verify that access to control plane interfaces is restricted to authorized personnel only.

---METADATA---
VENDOR: VMware
PRODUCT: Cloud Foundation, ESX, Workstation, Fusion
AFFECTED_VERSIONS: See vendor advisory for specific version ranges
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware products, including Cloud Foundation, ESX, Workstation, and Fusion, are affected by an out-of-bounds read vulnerability that could be exploited by an authenticated user.

Executive Summary:
Critical virtualization products from VMware are susceptible to an out-of-bounds read vulnerability that could be leveraged by attackers with high privileges to impact system stability.

Vulnerability Details

CVE-ID: CVE-2026-41703

Affected Software: VMware Cloud Foundation, vSphere Foundation, ESX, Workstation, Fusion, and Telco Cloud Platform

Affected Versions: Various versions, including Cloud Foundation 5.x prior to 5.2.3 and specific builds of ESXi 9.1, 9.0, and 8.0.

Vulnerability: This is an out-of-bounds read vulnerability (CWE-125). It requires an attacker to possess high privileges to successfully exploit the flaw, potentially resulting in unauthorized information disclosure or system instability.

Business Impact

The CVSS score of 7.6 indicates a high-severity threat to business operations. Exploitation could allow an attacker to read sensitive memory contents or cause a denial of service, potentially impacting the integrity and availability of virtualized workloads across the enterprise.

Remediation Plan

Immediate Action: Apply the specific security patches provided by Broadcom/VMware for your respective product version as listed in the official security advisory.

Proactive Monitoring: Monitor virtual machine and hypervisor logs for unexpected crashes or error messages related to memory access violations.

Compensating Controls: Restrict administrative access to the hypervisor management interface to a limited set of trusted personnel and secure management networks.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of August 1, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. While the requirement for high privileges mitigates the risk for external attackers, it remains a critical concern for insider threats or compromised administrative accounts.

Analyst Recommendation

Given the broad impact across VMware's product portfolio, administrators should consult the Broadcom support portal to identify and apply the correct patches for their environment. Immediate remediation is necessary to prevent potential exploitation of the hypervisor layer.

---METADATA---
VENDOR: VMware
PRODUCT: Fusion
AFFECTED_VERSIONS: 2025H2 up to (excluding) 2026H1
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
VMware Fusion is affected by a Time-of-check Time-of-use (TOCTOU) race condition in a SETUID binary, potentially leading to unauthorized privilege escalation.

Executive Summary:
A TOCTOU race condition in VMware Fusion's SETUID binary could allow a local attacker to achieve unauthorized elevation of privilege.

Vulnerability Details

CVE-ID: CVE-2026-41702

Affected Software: VMware Fusion

Affected Versions: 2025H2 up to (excluding) 2026H1

Vulnerability: The vulnerability is a Time-of-check Time-of-use (TOCTOU) race condition (CWE-367) occurring within a SETUID binary. This allows a local, authenticated user to manipulate the execution flow during the window between the security check and the subsequent operation.

Business Impact

With a CVSS score of 7.8 (High), this vulnerability poses a severe threat to local system integrity. An attacker who has already gained low-privileged access to the host machine could exploit this race condition to escalate privileges, potentially leading to full system compromise or unauthorized access to virtualized guest environments.

Remediation Plan

Immediate Action: Apply the vendor-provided security update immediately to patch the affected SETUID binary.

Proactive Monitoring: Monitor system logs for unexpected process execution or errors related to VMware binary operations that may indicate race condition exploitation attempts.

Compensating Controls: Limit local user access to the host system and ensure that only trusted users have the ability to execute VMware Fusion operations.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of May 16, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. TOCTOU vulnerabilities often require precise timing, making them complex to exploit reliably.

Analyst Recommendation

Security teams must prioritize the deployment of the vendor's patch to address the TOCTOU vulnerability in VMware Fusion. Ensuring the host environment is hardened against local privilege escalation is critical to mitigating the risk posed by this flaw.

---METADATA---
VENDOR: VMware
PRODUCT: Aria Operations
AFFECTED_VERSIONS: See vendor advisory for specific affected versions
---END_METADATA---

Description Summary:
VMware Aria Operations contains a command injection vulnerability that could allow an attacker to execute arbitrary commands on the affected system.

Executive Summary:
VMware Aria Operations is susceptible to a critical command injection vulnerability that could allow an attacker to achieve full system compromise by executing unauthorized code.

Vulnerability Details

CVE-ID: CVE-2026-22719

Affected Software: VMware Aria Operations

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: This vulnerability is a command injection flaw, typically occurring when an application passes unsafe user-supplied data to a system shell. This allows an attacker to break out of the intended application logic and execute arbitrary operating system commands.

Business Impact

Command injection is one of the most dangerous classes of vulnerabilities. A successful exploit could allow an attacker to gain a persistent foothold in the environment, steal sensitive operational data, or deploy ransomware. The CVSS score of 8.1 underscores the high severity and the potential for total loss of system integrity and confidentiality.

Remediation Plan

Immediate Action: Apply the security patches provided by VMware (Broadcom) for Aria Operations immediately.

Proactive Monitoring: Inspect system logs for the execution of unexpected shell commands, especially those originating from web service accounts (e.g., 'www-data' or 'tomcat').

Compensating Controls: Ensure that Aria Operations instances are not exposed directly to the public internet and are protected by robust network segmentation and a WAF.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of February 26, 2026, there is no public information indicating active exploitation of this vulnerability. However, VMware products are high-value targets for advanced persistent threat (APT) actors, and command injection flaws are frequently weaponized.

Analyst Recommendation

The severity of a command injection vulnerability in a management platform like Aria Operations cannot be overstated. Organizations must prioritize this update above standard maintenance cycles. Immediate patching is the primary recommendation to prevent unauthorized actors from seizing control of critical infrastructure monitoring tools.

Executive Summary:
A high-severity vulnerability has been identified in VMware NSX that allows an attacker to determine valid usernames on the system. This type of information disclosure, known as username enumeration, does not grant direct access but provides attackers with the necessary account information to launch targeted password-spraying or brute-force attacks. Successful exploitation could lead to unauthorized access to the network infrastructure managed by VMware products.

Vulnerability Details

CVE-ID: CVE-2025-41252

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability exists within the authentication mechanism of VMware NSX, which provides distinguishable responses for valid and invalid usernames. An unauthenticated remote attacker can exploit this by sending a series of authentication requests with potential usernames. By analyzing the server's responses (e.g., error messages, response times), the attacker can compile a list of valid user accounts, which can then be used as a target list for further attacks.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 7.5. The primary business impact is the loss of confidentiality regarding user account information, which significantly increases the risk of account compromise. Attackers can leverage the enumerated usernames to conduct more efficient password-spraying, credential stuffing, or brute-force attacks. A successful account takeover on a critical infrastructure product like VMware NSX could lead to unauthorized network modifications, security policy bypass, lateral movement within the network, and potential data breaches.

Remediation Plan

Immediate Action: Apply the security updates provided by VMware to all affected systems immediately. Before and after patching, it is crucial to review authentication and access logs for any signs of enumeration activity, such as a high volume of failed login attempts from a single source IP against multiple usernames.

Proactive Monitoring: Implement monitoring rules to detect and alert on anomalous authentication patterns. This includes a high rate of failed logins from a single IP address, login attempts using sequential or common usernames, and unusual traffic to authentication endpoints. System administrators should closely monitor NSX audit logs for any unauthorized configuration changes.

Compensating Controls: If patching cannot be performed immediately, implement compensating controls to mitigate the risk. These include enforcing rate-limiting on authentication interfaces to slow down automated attacks, using a Web Application Firewall (WAF) to block malicious IP addresses exhibiting enumeration behavior, and ensuring Multi-Factor Authentication (MFA) is enabled for all accounts to prevent takeover even if credentials are compromised.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of September 29, 2025, there are no known public exploits or active exploitation campaigns targeting this vulnerability. However, username enumeration flaws are often straightforward to exploit, and proof-of-concept code may become available quickly. Organizations should assume that threat actors will soon develop tools to leverage this weakness.

Analyst Recommendation

Given the high CVSS score and the critical role of VMware NSX in network security and management, it is strongly recommended that organizations prioritize the deployment of the vendor-supplied patches. Although this vulnerability is not currently listed on the CISA KEV list, its nature makes it an attractive target for attackers as a precursor to more significant intrusions. In addition to patching, organizations must enforce strong password policies and MFA as a defense-in-depth measure to protect against credential-based attacks that would follow successful username enumeration.

Executive Summary:
A high-severity vulnerability has been identified in VMware's NSX product line, stemming from a weak password recovery mechanism. This flaw could allow a remote attacker to reset the password of a privileged user, leading to unauthorized administrative access and complete compromise of the network virtualization and security platform.

Vulnerability Details

CVE-ID: CVE-2025-41251

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability exists within the password recovery function of VMware NSX. This mechanism fails to generate sufficiently random or unpredictable tokens for password reset requests. An unauthenticated, remote attacker could potentially predict or brute-force a valid password reset token, allowing them to change the password for an arbitrary user account, including administrative accounts, and gain unauthorized access to the NSX management interface.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 8.1. Successful exploitation would grant an attacker administrative control over the NSX environment, posing a critical risk to the organization. An attacker could reconfigure virtual networks, disable micro-segmentation and firewall rules, intercept or redirect sensitive network traffic, and use their position to move laterally across the entire data center infrastructure, potentially leading to widespread system compromise and significant data breaches.

Remediation Plan

Immediate Action: The primary remediation is to apply the security updates released by VMware to all affected NSX instances immediately. After patching, it is crucial to review authentication and access logs for any signs of unauthorized password resets or suspicious administrative activity that occurred prior to the patch deployment.

Proactive Monitoring: Security teams should actively monitor for indicators of compromise. This includes looking for an unusual volume of password reset requests from specific IP addresses, successful password changes for administrative accounts originating from untrusted networks, and any unexpected configuration changes to firewall rules, network segments, or user accounts within the NSX Manager.

Compensating Controls: If immediate patching is not feasible, implement compensating controls to reduce the attack surface. Restrict access to the NSX management interface to a secure, isolated management network or specific administrative jump boxes. Enforce multi-factor authentication (MFA) on all administrative accounts, as this may provide an additional layer of protection against a simple password reset attack.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of September 29, 2025, there are no known public proof-of-concept exploits available for this vulnerability, and it is not currently known to be actively exploited in the wild. However, given the criticality of VMware products, threat actors are likely to begin developing exploits rapidly.

Analyst Recommendation

Due to the high CVSS score of 8.1 and the critical role of VMware NSX in network infrastructure security, this vulnerability requires immediate attention. Although not yet listed on the CISA KEV (Known Exploited Vulnerabilities) catalog, its potential for granting full administrative access makes it a prime target for future exploitation. We strongly recommend that organizations prioritize the deployment of vendor-supplied patches across all affected systems in accordance with their vulnerability management policies to prevent a potential compromise of their network environment.

Executive Summary:
A high-severity vulnerability has been discovered in VMware vCenter that could allow an attacker to manipulate email headers sent by the system. This flaw, known as SMTP header injection, could be exploited to send deceptive phishing emails appearing to come from a trusted internal source, bypass email security filters, or potentially redirect sensitive information to an unauthorized recipient. Organizations are urged to apply security updates immediately to mitigate the risk of social engineering attacks and potential data leakage.

Vulnerability Details

CVE-ID: CVE-2025-41250

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability exists within a component of VMware vCenter responsible for sending email notifications. Due to improper input sanitization, an attacker with network access to the vCenter appliance can inject malicious characters (specifically Carriage Return and Line Feed - CRLF) into a data field that is later used to construct an SMTP email header. By injecting custom headers, such as Bcc: or a new Subject:, an attacker can silently add unauthorized recipients to official system emails, alter the email's content, or craft targeted phishing messages that bypass spam filters and appear legitimate to the recipient.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 8.5, reflecting the significant risk it poses to an organization. Successful exploitation could lead to highly effective phishing and social engineering campaigns, as malicious emails would originate from a trusted internal system (vCenter), increasing the likelihood of employees clicking malicious links or divulging sensitive credentials. Further impacts include the potential for data exfiltration if report data is redirected, reputational damage if the system is used to send spam, and the circumvention of existing email security controls, leaving the organization exposed to further attacks.

Remediation Plan

Immediate Action: The primary and most effective remediation is to apply the security updates provided by VMware immediately. Prioritize patching for vCenter instances that are exposed to the internet or manage critical production environments. After patching, review vCenter and mail server access logs for any signs of past exploitation attempts.

Proactive Monitoring:

• Log Analysis: Monitor mail server logs for any emails originating from vCenter with unusual or malformed headers. Scrutinize vCenter application logs for input containing CRLF characters (\r\n or URL-encoded equivalents like %0d%0a) in fields related to email configuration or alerting.
• Network Traffic: Inspect outbound SMTP traffic from the vCenter server. Alert on connections to unknown or unauthorized mail domains and analyze emails with multiple or unexpected Bcc: or Cc: headers.
• System Behavior: Monitor for an anomalous increase in the volume of emails sent from the vCenter server, which could indicate misuse of the notification feature.

Compensating Controls: If immediate patching is not feasible, implement the following controls to reduce risk:

• Restrict outbound SMTP traffic from the vCenter server to a dedicated, trusted internal mail relay only.
• Configure the mail relay to strictly validate and sanitize email headers, stripping any injected CRLF sequences.
• Limit network access to the vCenter management interface to a segmented, trusted administrative network.
• Temporarily disable non-essential email notification features within vCenter until patching can be completed.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of September 29, 2025, there are no known public exploits or reports of this vulnerability being actively exploited in the wild. However, vulnerabilities in critical enterprise products like VMware vCenter are attractive targets for threat actors. It is highly probable that a proof-of-concept (PoC) exploit will be developed and published shortly after the release of the vendor patch.

Analyst Recommendation

Given the high CVSS score of 8.5 and the critical role of VMware vCenter in managing virtual infrastructure, this vulnerability presents a significant risk to the organization. While this vulnerability is not currently listed on the CISA KEV catalog, its potential for enabling effective social engineering attacks and bypassing security controls warrants immediate action. We strongly recommend that the organization prioritize the remediation plan, applying the vendor-supplied patches to all affected systems without delay to prevent potential exploitation.

Executive Summary:
A high-severity vulnerability has been discovered in VMware Aria Operations and VMware Tools, which could allow a local attacker to gain full administrative control of an affected system. An attacker who already has basic user access can exploit this flaw to escalate their privileges, potentially leading to complete system compromise, data theft, or further attacks on the network. Immediate patching and review of user permissions are required to mitigate this significant risk.

Vulnerability Details

CVE-ID: CVE-2025-41244

Affected Software: VMware Aria Operations and VMware Tools

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: This is a local privilege escalation vulnerability that stems from improper permission handling on a core service or helper binary associated with VMware Aria Operations and VMware Tools. An authenticated attacker with low-level user privileges on a host or guest operating system can exploit this flaw. The attack involves manipulating or replacing a specific file or configuration that is subsequently accessed and executed by a service running with higher privileges (e.g., root on Linux or SYSTEM on Windows), leading to arbitrary code execution with elevated permissions.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 7.8. Successful exploitation would grant an attacker full administrative control over the compromised system. This could lead to severe consequences, including the installation of ransomware or other malware, exfiltration of sensitive corporate data, disabling of security controls, and using the compromised machine as a pivot point to attack other critical assets within the network. Given the foundational role of VMware products in modern IT infrastructure, a compromise of this nature presents a significant risk to business operations, data confidentiality, and system integrity.

Remediation Plan

Immediate Action:

• Apply Patches: Update all instances of VMware Aria Operations and VMware Tools to the patched versions provided by the vendor immediately. Prioritize patching on critical systems and servers.
• Review Permissions: Conduct a thorough audit of user permissions and access controls on all systems running the affected software. Enforce the principle of least privilege to ensure users only have the access necessary for their roles, limiting the initial foothold for an attacker.

Proactive Monitoring:

• Monitor for unauthorized modifications to files and directories associated with VMware installations.
• Audit system logs for unusual service restarts or processes being executed with elevated privileges (root/SYSTEM), especially those spawned by VMware services.
• Utilize Endpoint Detection and Response (EDR) solutions to detect suspicious command-line activity or parent-child process relationships originating from VMware components.

Compensating Controls:

• If immediate patching is not feasible, implement stricter file system access control lists (ACLs) on VMware installation directories to prevent modification by standard users.
• Deploy application whitelisting solutions to block the execution of unauthorized executables on critical systems.
• Increase monitoring and logging on vulnerable systems to enable rapid detection of any exploitation attempts or post-compromise activity.

Exploitation Status

Public Exploit Available: False

Analyst Notes: As of September 29, 2025, there is no known public proof-of-concept exploit code, and there are no reports of this vulnerability being actively exploited in the wild. However, privilege escalation vulnerabilities in widely deployed enterprise software are high-value targets for threat actors, who will likely begin reverse-engineering the patch to develop an exploit.

Analyst Recommendation

Given the high CVSS score of 7.8 and the critical role of VMware products in the enterprise, we strongly recommend that organizations prioritize the immediate deployment of the security patches provided by VMware. Although this vulnerability is not currently listed on the CISA KEV catalog, its nature makes it a prime candidate for future inclusion and widespread exploitation. Organizations should treat this as a critical priority and apply the necessary updates and reviews without delay to prevent potential system compromise.

Executive Summary:
A critical heap-overflow vulnerability has been identified in multiple VMware products, including ESXi, Workstation, and Fusion. An attacker with administrative access to a guest virtual machine could exploit this flaw to execute malicious code on the underlying host system, resulting in a full system compromise. This "VM escape" scenario poses a severe risk to data confidentiality, integrity, and availability for all virtual machines running on the affected host.

Vulnerability Details

CVE-ID: CVE-2025-41238

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability is a heap-overflow within the Paravirtualized SCSI (PVSCSI) controller component. An attacker who has already gained local administrative privileges on a guest virtual machine can send specially crafted SCSI commands to the PVSCSI device. This action triggers a heap-overflow condition, leading to an out-of-bounds memory write on the host system, which can be leveraged to achieve arbitrary code execution in the context of the hypervisor process.

Business Impact

This vulnerability is rated as Critical with a CVSS score of 9.3. A successful exploit would allow an attacker to break out of the guest virtual machine's isolated environment and gain control over the host hypervisor. This could lead to severe consequences, including the compromise of all other virtual machines on the host, unauthorized access to or exfiltration of sensitive data from any guest, deployment of ransomware across the virtualized infrastructure, and using the compromised host as a pivot point to attack the broader corporate network. The potential for complete loss of control over a virtualization host presents an extreme risk to business operations.

Remediation Plan

Immediate Action: Apply the security patches released by VMware immediately. Prioritize patching for internet-facing systems, multi-tenant environments, and hosts running critical business applications. After patching, it is crucial to monitor for any signs of exploitation attempts and review system and access logs for anomalous activity preceding the patching window.

Proactive Monitoring: Security teams should monitor for unusual activity on virtualization hosts, such as unexpected process creation, anomalous network connections originating from the hypervisor, or crashes related to the VM process. Within guest systems, monitor for suspicious administrative activities or the presence of known exploit tools. Review hypervisor logs for errors or warnings related to the PVSCSI controller or memory management failures.

Compensating Controls: If immediate patching is not possible, consider changing the virtual machine's SCSI controller from the vulnerable "VMware Paravirtual" (PVSCSI) to another type, such as "LSI Logic SAS," if performance and guest OS compatibility permit. Additionally, implementing strict network segmentation for hypervisor management interfaces and hardening guest operating systems to prevent initial administrative compromise can help reduce the overall risk.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of the publication date of Jul 15, 2025, there are no known public proof-of-concept exploits or reports of this vulnerability being actively exploited in the wild. The vulnerability is not currently listed on CISA's Known Exploited Vulnerabilities (KEV) catalog. However, given the critical nature of VM escape vulnerabilities, it is highly probable that threat actors and security researchers will work to develop exploits.

Analyst Recommendation
Due to the critical severity (CVSS 9.3) and the potential for a complete host system compromise, we strongly recommend that organizations prioritize the immediate application of vendor-supplied patches to all affected VMware products. This vulnerability represents a significant threat to the security of your virtualized environment. While it is not yet known to be exploited, its high impact makes it a prime target for future attacks. If patching cannot be performed immediately, implement the suggested compensating controls to mitigate the risk until patches can be deployed.

Executive Summary:
A critical vulnerability has been discovered in VMware ESXi, Workstation, and Fusion products, identified as CVE-2025-41237. This flaw allows a malicious actor with administrative access to a guest virtual machine to escape the virtual environment and execute code on the underlying host system. Successful exploitation could lead to a complete compromise of the host server, granting the attacker control over all other virtual machines and the host's resources.

Vulnerability Details

CVE-ID: CVE-2025-41237

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability is an integer underflow within the Virtual Machine Communication Interface (VMCI), a core component that facilitates high-speed communication between a virtual machine and the host hypervisor. An attacker with local administrative privileges on a guest VM can send specially crafted data to the VMCI service. This triggers an integer underflow during a memory allocation calculation, which in turn leads to an out-of-bounds write, allowing the attacker to write arbitrary data to an unintended memory location on the hypervisor. This memory corruption can be leveraged to achieve arbitrary code execution on the host system, resulting in a "VM escape."

Business Impact

This vulnerability is rated as critical severity with a CVSS score of 9.3, posing a severe risk to the organization. Exploitation allows an attacker to break out of the isolated guest environment and gain full control over the host hypervisor. This compromise would expose all other virtual machines running on the same host, leading to potential widespread data theft, service disruption, and loss of data integrity. An attacker could deploy ransomware across the entire virtualized infrastructure, steal sensitive corporate data from any VM, or use the compromised host as a launchpad for further attacks into the corporate network.

Remediation Plan

Immediate Action: The primary remediation is to apply the security updates provided by VMware as soon as possible. System administrators should prioritize patching all affected ESXi hosts, Workstation installations, and Fusion instances to the versions specified in the vendor advisory.

Proactive Monitoring: Implement enhanced monitoring for signs of exploitation. Security teams should look for unexpected hypervisor reboots or crashes (e.g., purple screen of death on ESXi), anomalous log entries related to the VMCI service, and any unusual processes or kernel-level activity on the host systems. Use SIEM and EDR solutions to monitor for suspicious memory access patterns or privilege escalation attempts originating from guest VMs.

Compensating Controls: If immediate patching is not possible, implement the following controls to reduce risk:

• Restrict administrative access to virtual machines to only highly trusted personnel.
• Enforce strict network segmentation to isolate critical virtual machines and limit the potential impact of a host compromise.
• Harden guest operating systems to make it more difficult for an attacker to gain initial administrative privileges.
• Ensure ESXi hosts are in "Lockdown Mode" to restrict management access to the host.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of Jul 15, 2025, there are no known public proof-of-concept exploits or active attacks targeting this vulnerability. However, VM escape vulnerabilities are highly valued by advanced threat actors, and it is anticipated that exploits will be developed. The vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog.

Analyst Recommendation
Given the critical severity (CVSS 9.3) and the direct path to a full hypervisor compromise, this vulnerability represents an urgent and significant risk to the organization's virtualized infrastructure. We strongly recommend that the vendor-supplied patches be applied on an emergency basis across all affected VMware products. While this CVE is not yet on the CISA KEV list, organizations should operate under the assumption that exploitation is imminent and prioritize remediation and monitoring efforts accordingly.

Executive Summary:
A critical vulnerability has been discovered in multiple VMware products, allowing a potential attacker to escape from a virtual machine and take control of the underlying host server. An attacker with administrative access to a single guest VM could leverage this flaw to compromise all other VMs on the same host, leading to a complete loss of data confidentiality, integrity, and availability for the affected infrastructure.

Vulnerability Details

CVE-ID: CVE-2025-41236

Affected Software: VMware Multiple Products

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability is an integer overflow within the VMXNET3 virtual network adapter component used by VMware ESXi, Workstation, and Fusion. An attacker who has already obtained local administrative privileges on a guest virtual machine can send specially crafted data to the VMXNET3 adapter. This action triggers the integer overflow, leading to a heap-based buffer overflow, which can be exploited to execute arbitrary code on the hypervisor (host) system. This constitutes a "VM escape," allowing the attacker to break out of the isolated guest environment and gain full control over the physical host machine.

Business Impact

This vulnerability is rated as critical severity with a CVSS score of 9.3, posing a severe risk to the organization. A successful exploit would result in a complete compromise of the hypervisor host. This would grant an attacker full access to all virtual machines running on that host, enabling them to steal sensitive data, install ransomware, delete critical systems, and disrupt core business operations. Furthermore, a compromised host can be used as a pivot point to launch further attacks against the internal network, significantly expanding the scope of the breach. The potential consequences include major data breaches, prolonged service outages, and significant reputational damage.

Remediation Plan

Immediate Action: The primary remediation is to apply the security patches provided by the vendor. System administrators must prioritize updating all affected VMware ESXi, Workstation, and Fusion instances to the latest recommended versions as soon as possible. After patching, monitor systems for any indicators of compromise that may have occurred prior to the update and review system and access logs for suspicious activity.

Proactive Monitoring: Implement enhanced monitoring on hypervisor hosts. Look for unexpected crashes or reboots of host systems, unusual resource consumption by the VMXNET3 process, and anomalous network traffic originating from the hypervisor's management interface. On guest VMs, monitor for any unauthorized administrative access or privilege escalation attempts that could be a precursor to an exploit attempt.

Compensating Controls: If immediate patching is not feasible, implement the following controls to reduce risk:

• Strictly limit administrative access to all guest virtual machines.
• Implement micro-segmentation to restrict network communication between VMs on the same host.
• Ensure that host-level intrusion detection and prevention systems (IDS/IPS) are enabled and configured to detect anomalous behavior.
• Isolate critical VMs on dedicated, fully patched hosts if possible.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of the published date, Jul 15, 2025, there are no known public exploits or active attacks leveraging this vulnerability in the wild. The vulnerability is not currently listed on CISA's Known Exploited Vulnerabilities (KEV) catalog. However, due to the critical severity and the high impact of a successful VM escape, security researchers and threat actors are highly motivated to develop a functional exploit.

Analyst Recommendation

Given the critical CVSS score of 9.3 and the potential for a full host compromise, this vulnerability represents an urgent threat. We strongly recommend that all affected VMware products be patched on an emergency basis. Although there is no evidence of active exploitation at this time, the risk of a future attack is extremely high. Organizations should treat this as a top priority for their patching cycle to prevent a catastrophic security breach of their virtualized environment.

---METADATA---
VENDOR: VMware
PRODUCT: ESXi
AFFECTED_VERSIONS: VMware ESXi 7.0 (before ESXi70U1c-17325551), VMware ESXi 6.7 (before ESXi670-202102401-SG), VMware ESXi 6.5 (before ESXi650-202102101-SG), VMware Cloud Foundation 4.x and 3.x.
---END_METADATA---

Description Summary:
A heap-overflow vulnerability in the OpenSLP service of VMware ESXi allows remote code execution for attackers on the same network segment.

Executive Summary:
A critical heap-overflow vulnerability in VMware ESXi's OpenSLP service is being actively exploited in the wild to deploy ransomware, requiring immediate patching or service disabling.

Vulnerability Details

CVE-ID: CVE-2021-21974

Affected Software: VMware ESXi

Affected Versions: VMware ESXi 7.0 (before ESXi70U1c-17325551), VMware ESXi 6.7 (before ESXi670-202102401-SG), VMware ESXi 6.5 (before ESXi650-202102101-SG), VMware Cloud Foundation 4.x and 3.x.

Vulnerability: This is a heap-overflow remote code execution vulnerability in the OpenSLP service. Attackers on the same network segment can exploit this flaw via port 427 to execute arbitrary code with elevated privileges.

Business Impact

This vulnerability carries a CVSS score of 8.8 and is currently being exploited in the wild, notably by the ESXiArgs ransomware. Successful exploitation allows for complete takeover of the hypervisor, leading to catastrophic data loss, operational downtime, and potential permanent loss of virtualized assets.

Remediation Plan

Immediate Action: Apply the specific patch versions (e.g., ESXi70U1c-17325551) listed in the VMware security advisory. If patching is not immediately feasible, disable the OpenSLP service on all ESXi hosts.

Proactive Monitoring: Monitor network traffic to port 427 for unauthorized connection attempts and audit ESXi logs for signs of unauthorized execution or unexpected file modifications.

Compensating Controls: Use network segmentation or firewalls to restrict access to port 427 to only authorized, trusted management hosts.

Exploitation Status

Public Exploit Available: true

Analyst Notes: Active exploitation campaigns have been observed, with attackers leveraging this vulnerability to deploy ransomware such as ESXiArgs.

Analyst Recommendation

This vulnerability is critical and confirmed to be under active exploitation. Organizations must treat this with the highest urgency. If hosts cannot be patched immediately, disabling the OpenSLP service is the required standard to prevent ransomware infection.