Description Summary:
A stack-based buffer overflow in the Wavlink Export Pingortrace CGI function allows unauthenticated remote attackers to execute arbitrary code via a malicious HTTP_COOKIE.

Executive Summary:
A critical buffer overflow vulnerability in Wavlink firmware enables unauthenticated remote code execution, posing a severe risk to device integrity.

Vulnerability Details

CVE-ID: CVE-2026-74843

Affected Software: Wavlink WN531P3 and WN535M1

Affected Versions: V250922

Vulnerability: The vulnerability exists in the strcpy function within the Export Pingortrace CGI component. An unauthenticated attacker can trigger a stack-based buffer overflow by manipulating the HTTP_COOKIE parameter, leading to potential arbitrary code execution.

Business Impact

Successful exploitation of this vulnerability grants an attacker full control over the affected network device. This facilitates unauthorized access to internal network traffic, potential interception of sensitive data, and the ability to pivot into the local environment, resulting in significant security compromise and potential operational downtime. The CVSS score of 10.0 reflects the extreme severity and the triviality of remote exploitation.

Remediation Plan

Immediate Action: Update the affected Wavlink devices to the latest available firmware version provided by the vendor.

Proactive Monitoring: Review web server access logs for anomalous HTTP_COOKIE values or unexpected requests directed at cgi-bin/export_pingortrace.cgi.

Compensating Controls: Implement strict perimeter firewall rules to restrict access to the management interfaces of these devices to trusted management subnets only.

Exploitation Status

Public Exploit Available: Yes, a public proof-of-concept document is available via GitHub.

Analyst Notes: As of August 17, 2026, there is no public information indicating active exploitation in the wild, though the existence of a public proof-of-concept makes the risk of exploitation highly credible. The flaw is inherently dangerous due to its location in a common CGI function reachable without authentication.

Analyst Recommendation

Given the critical nature of this vulnerability and the availability of proof-of-concept material, immediate patching is required. Organizations should prioritize updating all affected Wavlink hardware to the latest firmware to prevent unauthorized remote access and potential compromise of the local network.

Description Summary:
A high-severity vulnerability has been identified in the Wavlink WL-WN579X3-C router, version 231124, which could allow for remote exploitation.

Executive Summary:
The Wavlink WL-WN579X3-C router contains a high-severity vulnerability that could compromise the security and integrity of the network device.

Vulnerability Details

CVE-ID: CVE-2026-5004

Affected Software: Wavlink WL-WN579X3-C

Affected Versions: 231124

Vulnerability: While specific technical details are limited in the initial disclosure, the vulnerability affects the Wavlink WL-WN579X3-C router. Based on the CVSS score of 8.8, it likely involves a remote, unauthenticated flaw such as command injection or an authentication bypass.

Business Impact

A compromise of a perimeter networking device like a router allows attackers to intercept traffic, launch man-in-the-middle (MitM) attacks, or gain a foothold in the internal network. The CVSS score of 8.8 indicates a significant risk to the organization's network perimeter.

Remediation Plan

Immediate Action: Apply the latest firmware updates from Wavlink for the WL-WN579X3-C model immediately.

Proactive Monitoring: Monitor the router for unauthorized configuration changes, unusual outbound traffic, or unauthorized administrative logins.

Compensating Controls: Disable remote management interfaces on the WAN side of the router and ensure that strong, unique administrative credentials are in use.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of March 29, 2026, there is no public information indicating active exploitation. Users of this hardware should remain vigilant as routers are frequent targets for botnets and advanced persistent threats.

Analyst Recommendation

Network hardware vulnerabilities must be treated with the highest urgency. Organizations should immediately verify the firmware version of any Wavlink WL-WN579X3-C devices in their inventory and apply all relevant security patches to prevent external exploitation.

Description Summary:
Wavlink WL-WN578W2 firmware contains a command injection vulnerability in the Delete_Mac_list/SetName/GuestWifi functions, enabling remote attackers to execute arbitrary commands.

Executive Summary:
A critical command injection vulnerability in Wavlink WL-WN578W2 devices allows remote attackers to execute arbitrary code and fully compromise the network hardware.

Vulnerability Details

CVE-ID: CVE-2026-4164

Affected Software: Wavlink WL-WN578W2

Affected Versions: 221110

Vulnerability: The flaw resides in the POST request handler for /cgi-bin/wireless.cgi, specifically affecting the Delete_Mac_list, SetName, and GuestWifi functions. Attackers can inject malicious commands through these parameters without requiring local access.

Business Impact

This vulnerability leads to total device compromise, allowing attackers to monitor unencrypted traffic and redirect users to malicious sites. With a CVSS score of 9.8, the risk is Critical, as these devices often serve as the primary security barrier for small office and home networks.

Remediation Plan

Immediate Action: Immediately install the latest firmware update provided by Wavlink to patch the vulnerable CGI components.

Proactive Monitoring: Audit the device for any unfamiliar MAC addresses in the allowed list or unauthorized Guest Wi-Fi accounts.

Compensating Controls: Implement strict firewall rules to prevent access to the router's web management interface from external networks.

Exploitation Status

Public Exploit Available: Yes

Analyst Notes: As of March 16, 2026, the exploit for this vulnerability has been published. The availability of public exploit code makes it highly likely that automated scans are currently targeting these devices.

Analyst Recommendation

The presence of a public exploit and the Critical severity of the flaw necessitate immediate action. Update the firmware now. If an update is not available, the device should be taken offline or replaced to prevent it from becoming a bridgehead for attackers.

Description Summary:
A command injection vulnerability in the SetName/GuestWifi function of Wavlink WL-WN579A3 firmware allows remote attackers to execute arbitrary commands via POST requests.

Executive Summary:
Wavlink WL-WN579A3 routers are vulnerable to a critical remote command injection flaw that allows attackers to take full control of the device.

Vulnerability Details

CVE-ID: CVE-2026-4163

Affected Software: Wavlink WL-WN579A3

Affected Versions: 220323

Vulnerability: The vulnerability is located in the SetName/GuestWifi function within /cgi-bin/wireless.cgi. By manipulating POST requests, a remote attacker can bypass input validation and execute arbitrary system commands on the device.

Business Impact

A successful exploit allows an attacker to intercept network traffic, change DNS settings, or enlist the device into a botnet. Given the CVSS score of 9.8, the impact is Critical, as it compromises the gateway of the local network, potentially exposing all connected devices to further attacks.

Remediation Plan

Immediate Action: Upgrade the Wavlink WL-WN579A3 firmware to the latest available version immediately.

Proactive Monitoring: Check router logs for suspicious POST requests directed at /cgi-bin/wireless.cgi and monitor for unauthorized changes to Wi-Fi configurations.

Compensating Controls: Disable remote management interfaces and ensure that the administrative interface is not accessible from the public internet.

Exploitation Status

Public Exploit Available: Yes

Analyst Notes: As of March 16, 2026, a public exploit is available. This significantly increases the risk of active exploitation, as the barrier to entry for attackers is now minimal.

Analyst Recommendation

Because a public exploit exists, this vulnerability must be remediated with the highest urgency. Administrators should flash the updated firmware immediately and verify that the device has not already been compromised by checking for unauthorized persistent scripts.

Description Summary:
A high-severity vulnerability has been identified in the Wavlink WL-WN579X3-C router, specifically affecting firmware version 231124, potentially allowing for unauthorized system compromise.

Executive Summary:
The Wavlink WL-WN579X3-C router contains a critical vulnerability that could allow an attacker to compromise the device, posing a significant risk to network integrity and data privacy.

Vulnerability Details

CVE-ID: CVE-2026-3715

Affected Software: Wavlink WL-WN579X3-C

Affected Versions: Version 231124

Vulnerability: This vulnerability involves a flaw in the device's firmware processing. Based on the high CVSS score and the nature of the hardware, it likely involves an unauthenticated path that allows for remote command execution or significant configuration manipulation.

Business Impact

A successful exploit of this vulnerability could lead to a total compromise of the network gateway, enabling attackers to intercept traffic, pivot to internal resources, or launch distributed denial-of-service (DDoS) attacks. With a CVSS score of 8.8, the severity is classified as High, reflecting the potential for complete loss of confidentiality and integrity for all data passing through the affected hardware.

Remediation Plan

Immediate Action: Administrators must immediately update the Wavlink WL-WN579X3-C firmware to the latest secure version provided by the vendor to close the vulnerability.

Proactive Monitoring: Review device system logs for unauthorized configuration changes or unusual outbound traffic patterns that may indicate a persistent compromise.

Compensating Controls: If patching is delayed, restrict administrative access to the device's web interface to trusted internal IP addresses only and disable remote management features.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of March 8, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw in a common networking peripheral, the potential for exploitation is high once technical details are reverse-engineered.

Analyst Recommendation

The high CVSS score of 8.8 necessitates an immediate response to prevent unauthorized network access. Organizations using Wavlink hardware should prioritize this firmware update as part of their emergency patch management cycle to mitigate the risk of perimeter breach.

Description Summary:
A remote out-of-bounds write vulnerability in the Wavlink NU516U1 router allows attackers to manipulate the ipaddr argument in /cgi-bin/login.cgi, potentially leading to full system compromise.

Executive Summary:
A critical out-of-bounds write vulnerability in Wavlink NU516U1 routers allows remote attackers to execute arbitrary code and gain full control over the device.

Vulnerability Details

CVE-ID: CVE-2026-3703

Affected Software: Wavlink NU516U1

Affected Versions: 251208

Vulnerability: This flaw exists within the sub_401A10 function of the /cgi-bin/login.cgi file. A remote, unauthenticated attacker can manipulate the ipaddr argument to trigger an out-of-bounds write, leading to memory corruption and potential code execution.

Business Impact

A successful exploit allows an external actor to gain unauthorized access to the router’s operating system. This could result in the interception of network traffic, credential theft, or the recruitment of the device into a botnet. The CVSS score of 9.8 reflects the critical nature of this vulnerability due to its remote exploitability and the availability of public exploit code.

Remediation Plan

Immediate Action: Update the router firmware to the latest version provided by Wavlink immediately, as a fix has been professionally released.

Proactive Monitoring: Monitor network traffic for unusual outbound connections and review device logs for suspicious activity originating from the /cgi-bin/login.cgi endpoint.

Compensating Controls: Restrict access to the router’s web management interface from the public internet using a firewall or VPN to minimize the attack surface.

Exploitation Status

Public Exploit Available: true

Analyst Notes: As of Mar 8, 2026, a public exploit has been released for this vulnerability. Organizations using this hardware must prioritize patching immediately, as the barrier to entry for attackers is significantly lowered by the public disclosure of exploit mechanics.

Analyst Recommendation

The severity of this vulnerability, combined with the availability of a public exploit, necessitates immediate remediation. Administrators should verify the firmware version of all Wavlink NU516U1 devices and apply the vendor-provided patch without delay to prevent unauthorized remote access.

Description Summary:
A security vulnerability has been identified in the Wavlink WL-NU516U1 firmware version 20251208, posing a risk to device integrity.

Executive Summary:
The Wavlink WL-NU516U1 device running firmware version 20251208 contains a high-severity vulnerability that could allow attackers to compromise the device.

Vulnerability Details

CVE-ID: CVE-2026-2567

Affected Software: Wavlink WL-NU516U1

Affected Versions: 20251208

Vulnerability: This flaw specifically affects the 20251208 build of the Wavlink WL-NU516U1 firmware. With a CVSS score of 7.2, the vulnerability likely allows for unauthorized administrative actions or information disclosure through the device's management protocols.

Business Impact

A successful exploit could allow an attacker to gain control over the network device, leading to potential data breaches or denial-of-service conditions. This high-severity risk necessitates immediate action to maintain the security of the network perimeter and internal segments where these devices reside.

Remediation Plan

Immediate Action: Update the firmware to the newest available secure version beyond 20251208 immediately.

Proactive Monitoring: Review administrative logs for any login attempts from unknown IP addresses and monitor for unusual traffic patterns originating from the device.

Compensating Controls: Implement strong password policies for device management and use network segmentation to isolate the device from critical assets.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of February 17, 2026, there is no evidence of active exploitation. However, the high CVSS score indicates that the flaw is serious enough to be targeted by sophisticated actors.

Analyst Recommendation

The 7.2 CVSS score highlights a significant security gap. It is recommended that administrators replace or update the firmware on all affected Wavlink devices to prevent unauthorized access and potential lateral movement within the network.

Description Summary:
A high-severity security vulnerability has been detected in Wavlink WL-NU516U1 devices, affecting firmware versions up to 130 and 260.

Executive Summary:
Wavlink WL-NU516U1 network devices are vulnerable to a high-severity flaw that could lead to unauthorized access or control of the network hardware.

Vulnerability Details

CVE-ID: CVE-2026-2566

Affected Software: Wavlink WL-NU516U1

Affected Versions: Up to 130/260

Vulnerability: The vulnerability in the Wavlink WL-NU516U1 involves a security flaw in the device's firmware. While the specific CWE is not listed, a CVSS score of 7.2 suggests a significant impact, likely related to improper authentication or input handling in the management interface.

Business Impact

Compromise of network hardware can lead to traffic interception, unauthorized network access, and disruption of connectivity. Given the CVSS score of 7.2, the risk to business operations is substantial, especially if these devices are used to bridge or manage sensitive network segments.

Remediation Plan

Immediate Action: Apply the latest firmware updates from Wavlink for the WL-NU516U1 model immediately.

Proactive Monitoring: Monitor network logs for unauthorized access to the device's administrative web interface and check for unexpected configuration changes.

Compensating Controls: Disable the web management interface on the WAN side and ensure that any local management is performed over a secure, encrypted connection.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of February 17, 2026, no active exploitation has been reported. Users should remain vigilant as network devices are frequent targets for botnet recruitment.

Analyst Recommendation

Organizations should immediately identify any Wavlink WL-NU516U1 devices within their environment and verify their firmware status. Applying the vendor's security updates is essential to mitigate the risk of unauthorized access to the network infrastructure.

Description Summary:
Multiple Wavlink networking devices are vulnerable to stack-based buffer overflows and memory corruption, potentially allowing remote code execution.

Executive Summary:
A critical memory corruption vulnerability in various Wavlink network devices could allow an authenticated attacker to compromise system integrity.

Vulnerability Details

CVE-ID: CVE-2026-18607

Affected Software: Wavlink WN572, WN570H, WN573, WN529, WN530, WN531

Affected Versions: 20260609

Vulnerability: The affected devices are prone to stack-based buffer overflows (CWE-121) and general memory corruption (CWE-119). These flaws require the attacker to have low-level privileges to successfully trigger the vulnerable memory condition.

Business Impact

Exploitation of these vulnerabilities may result in a complete system compromise, enabling an attacker to execute arbitrary code with elevated privileges. Given the CVSS score of 8.8, this flaw poses a severe risk to network security, as compromised devices can be used as pivot points for further lateral movement within the network.

Remediation Plan

Immediate Action: Apply the latest firmware updates provided by Wavlink for the affected device models.

Proactive Monitoring: Review device access logs for signs of unauthorized configuration changes or anomalous traffic patterns indicative of memory corruption attempts.

Compensating Controls: Restrict management interface access to trusted IP addresses only and disable unnecessary services to minimize the attack surface.

Exploitation Status

Public Exploit Available: unknown

Analyst Notes: As of August 4, 2026, there is no confirmed active exploitation in the wild; however, per CISA's SSVC assessment a proof-of-concept exists, so exploitation risk should be treated as credible. These memory corruption vulnerabilities are historically common targets for weaponized exploits.

Analyst Recommendation

The presence of a proof-of-concept necessitates immediate action. Administrators must verify the firmware version of all deployed Wavlink hardware and apply updates to prevent the potential for remote code execution.

Description Summary:
A stack-based buffer overflow in the nas.cgi component of Wavlink WL-NU516U1 allows remote unauthenticated attackers to execute arbitrary code via the User1Passwd argument.

Executive Summary:
A critical remote code execution vulnerability in Wavlink WL-NU516U1 firmware poses a severe risk of full system compromise for affected devices.

Vulnerability Details

CVE-ID: CVE-2026-18589

Affected Software: Wavlink WL-NU516U1

Affected Versions: 708c073-mt7628

Vulnerability: This is a stack-based buffer overflow vulnerability occurring in the change_password function within the nas.cgi file. The vulnerability is exploitable remotely by an unauthenticated attacker who can send a crafted request to the User1Passwd argument.

Business Impact

Successful exploitation of this flaw allows an attacker to execute arbitrary code with elevated privileges on the affected networking device. This could lead to complete system takeover, unauthorized access to network traffic, and the potential for lateral movement into the internal network. Given the CVSS score of 9.8, this vulnerability is classified as critical and requires immediate attention to prevent unauthorized access.

Remediation Plan

Immediate Action: Update the Wavlink WL-NU516U1 firmware to the latest version provided by the vendor to patch the buffer overflow vulnerability.

Proactive Monitoring: Monitor network traffic and device logs for suspicious access requests to the nas.cgi file, specifically focusing on unusually long input strings in password fields.

Compensating Controls: Deploy a Web Application Firewall (WAF) or an Intrusion Prevention System (IPS) to filter malicious requests containing abnormally large payloads targeted at the nas.cgi endpoint.

Exploitation Status

Public Exploit Available: Yes, a public proof-of-concept report is available via GitHub.

Analyst Notes: As of August 3, 2026, there is no confirmed active exploitation in the wild; however, a public proof-of-concept exists, so exploitation risk should be treated as credible. The nature of this memory corruption vulnerability makes it a high-value target for automated exploitation tools.

Analyst Recommendation

The critical severity of this vulnerability, combined with the availability of public technical details, necessitates an immediate patching cycle. Administrators should prioritize upgrading all affected Wavlink WL-NU516U1 devices to the vendor-supplied firmware release to eliminate the underlying memory corruption risk.

Description Summary:
The Wavlink WL-NU516U1 router contains a stack-based buffer overflow vulnerability in the nas.cgi file, which can be triggered by manipulating the CONTENT_LENGTH argument.

Executive Summary:
A stack-based buffer overflow in the Wavlink WL-NU516U1 router allows an unauthenticated remote attacker to execute arbitrary code or crash the device.

Vulnerability Details

CVE-ID: CVE-2026-18588

Affected Software: Wavlink WL-NU516U1

Affected Versions: 708c073-mt7628

Vulnerability: The vulnerability exists in the fgets function within the nas.cgi component. An unauthenticated attacker can send a crafted request with a malicious CONTENT_LENGTH value, causing memory corruption on the stack.

Business Impact

Successful exploitation allows for remote code execution with the privileges of the web service, leading to full system compromise. Given the critical CVSS score of 9.8, the potential for device takeover, data exfiltration, and persistent access within a private network is extremely high.

Remediation Plan

Immediate Action: Update the Wavlink WL-NU516U1 firmware to the version provided by the vendor (WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin).

Proactive Monitoring: Monitor network traffic for anomalous HTTP POST requests directed at nas.cgi that contain unusually large or malformed header values.

Compensating Controls: Restrict access to the router management interface to trusted internal IP addresses and employ a WAF to filter out malformed HTTP requests.

Exploitation Status

Public Exploit Available: Yes — a public report and proof-of-concept repository exist on GitHub.

Analyst Notes: As of August 3, 2026, there is no confirmed active exploitation in the wild; however, a public proof-of-concept exists, so exploitation risk should be treated as credible. The presence of a public PoC significantly lowers the barrier to entry for potential attackers.

Analyst Recommendation

This vulnerability is highly severe and easily reachable from the network. Immediate firmware updates are required to prevent potential remote code execution. If patching is not immediately possible, disable remote management features and restrict access to the device management interface.

Description Summary:
The Wavlink WL-NU516U1 device is susceptible to OS command injection, which could allow an unauthenticated attacker to execute arbitrary commands with high privileges.

Executive Summary:
A critical command injection vulnerability in the Wavlink WL-NU516U1 firmware poses a severe risk of unauthorized system control.

Vulnerability Details

CVE-ID: CVE-2026-18587

Affected Software: Wavlink WL-NU516U1

Affected Versions: 708c073-mt7628

Vulnerability: This is an OS command injection vulnerability, categorized under CWE-78 and CWE-77. It allows remote, unauthenticated attackers to achieve full compromise of the affected device.

Business Impact

Successful exploitation allows an attacker to gain full control over the device, leading to potential data theft, lateral movement within the network, or complete system takeover. The CVSS score of 7.5 highlights the high impact on confidentiality, integrity, and availability.

Remediation Plan

Immediate Action: Update the device firmware to the version provided by the vendor (WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin).

Proactive Monitoring: Review device management interfaces and system logs for suspicious command execution patterns or unauthorized configuration changes.

Compensating Controls: Utilize a Web Application Firewall or network access control lists to block malicious payloads targeting the device management interface.

Exploitation Status

Public Exploit Available: Yes, a proof-of-concept report is available on GitHub (oduoke567 repository).

Analyst Notes: As of August 3, 2026, there is no confirmed active exploitation in the wild, but the availability of a public proof-of-concept makes the exploitation risk credible. The vulnerability is highly exploitable due to the nature of command injection flaws.

Analyst Recommendation

This vulnerability carries a severe risk due to the potential for full system compromise. Users of the affected Wavlink hardware must apply the provided firmware update immediately to prevent unauthorized access.

Description Summary:
A security vulnerability has been identified in the Wavlink WL-NU516U1-A device firmware, potentially allowing unauthorized system impact.

Executive Summary:
A critical security vulnerability in the Wavlink WL-NU516U1-A firmware poses a significant risk of unauthorized access or system compromise.

Vulnerability Details

CVE-ID: CVE-2026-13539

Affected Software: Wavlink WL-NU516U1-A

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: The vulnerability exists within the device firmware, though specific technical parameters are currently limited. Given the high CVSS score, it is assumed that an attacker could potentially achieve unauthorized execution or configuration changes.

Business Impact

Successful exploitation of this vulnerability could result in full device compromise, leading to unauthorized network access or the interception of sensitive traffic. With a CVSS score of 8.8, this flaw represents a high-severity risk that could lead to significant operational disruption and data exposure if left unmitigated.

Remediation Plan

Immediate Action: Check the official Wavlink support portal for available firmware patches and apply them to all affected units immediately.

Proactive Monitoring: Review device access logs for unusual administrative login attempts or configuration changes that deviate from established baselines.

Compensating Controls: Isolate the affected devices from public-facing network segments and utilize firewall rules to restrict management interface access to trusted internal IP addresses.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of June 29, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.

Analyst Recommendation

Given the high severity of this vulnerability, administrators should prioritize the identification of all affected Wavlink devices within their environment. Applying vendor-supplied firmware updates is the only definitive method to remediate this risk; if patches are unavailable, strict network segmentation is required to prevent unauthorized exploitation.

Description Summary:
A buffer overflow vulnerability in the Wavlink M86X3A router allows unauthenticated attackers to execute arbitrary code or cause a denial of service via a crafted Cookie parameter.

Executive Summary:
A critical buffer overflow vulnerability in the Wavlink M86X3A router permits unauthenticated remote code execution, posing a severe risk to network integrity.

Vulnerability Details

CVE-ID: CVE-2025-55847

Affected Software: Wavlink M86X3A

Affected Versions: See vendor advisory

Vulnerability: This is a buffer overflow flaw located in the /cgi-bin/ExportAllSettings.cgi file, triggered by improper input validation of the Cookie parameter. The CVSS vector (AV:A/AC:L/PR:N) confirms that an unauthenticated attacker on the adjacent network can exploit this vulnerability without user interaction.

Business Impact

The ability for an unauthenticated attacker to execute arbitrary code on network infrastructure can lead to full system compromise, unauthorized access to sensitive traffic, and total loss of device availability. With a CVSS score of 7.5, this high-severity vulnerability represents a significant threat to internal network security and operational continuity.

Remediation Plan

Immediate Action: Contact the vendor immediately to obtain firmware updates that address this buffer overflow, as no public patch is currently confirmed.

Proactive Monitoring: Monitor network traffic for unusual activity directed at the /cgi-bin/ directory and inspect device logs for signs of segmentation faults or unexpected reboots.

Compensating Controls: Implement strict network segmentation to isolate the affected device from untrusted segments and utilize a Web Application Firewall to block requests containing malformed or excessively long Cookie strings.

Exploitation Status

Public Exploit Available: Yes — a published proof-of-concept exists as referenced in the vulnerability research write-up on GitHub.

Analyst Notes: As of September 29, 2025, there is no confirmed active exploitation in the wild; however, per CISA's SSVC assessment a proof-of-concept exists, so exploitation risk should be treated as credible. The presence of a technical write-up detailing the exploit mechanism elevates the urgency of applying defensive measures.

Analyst Recommendation

Given the potential for remote code execution and the availability of a public proof-of-concept, this vulnerability must be treated with high priority. Administrators should isolate affected devices from the internet immediately and prioritize firmware remediation once the manufacturer releases a secure update.

Description Summary:
A command injection vulnerability in the Wavlink WN535K3 router allows unauthenticated attackers to execute arbitrary system commands via the newpass parameter in the set_sys_adm function.

Executive Summary:
The Wavlink WN535K3 router contains a critical command injection vulnerability that allows unauthenticated remote attackers to achieve full system compromise.

Vulnerability Details

CVE-ID: CVE-2025-50756

Affected Software: Wavlink WN535K3

Affected Versions: 20191010

Vulnerability: This is a command injection vulnerability located in the set_sys_adm function. An unauthenticated attacker can trigger the flaw by sending a crafted request containing malicious input to the newpass parameter.

Business Impact

The ability for an unauthenticated attacker to execute arbitrary commands on a network device poses a severe risk to organizational security. Successful exploitation could lead to full device takeover, enabling attackers to intercept network traffic, pivot into internal segments, or establish persistent backdoors. Given the CVSS score of 9.8, this vulnerability represents a critical threat to confidentiality, integrity, and availability.

Remediation Plan

Immediate Action: Since a specific patch version is not currently identified, users should restrict administrative access to the device to trusted management interfaces only and disconnect the device from the public internet immediately.

Proactive Monitoring: Security teams should monitor network traffic for suspicious HTTP requests targeting the set_sys_adm function and investigate any unusual outbound traffic originating from the router.

Compensating Controls: Deploy a Web Application Firewall or an intrusion detection system to filter out requests containing malicious command patterns directed at the device administration interface.

Exploitation Status

Public Exploit Available: Yes, a public proof-of-concept exists, attributed to the technical write-up provided in the referenced GitHub repository.

Analyst Notes: As of July 14, 2025, there is no confirmed active exploitation in the wild. However, the availability of a public proof-of-concept makes this vulnerability highly dangerous, as it lowers the barrier for entry for malicious actors.

Analyst Recommendation

Due to the critical nature of this command injection flaw and the availability of public proof-of-concept code, immediate mitigation is required. Organizations using the affected Wavlink hardware should isolate the device from external networks and contact the vendor for guidance on available firmware updates. Failure to secure this device could lead to complete compromise of the local network environment.