The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient
Description
The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
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VENDOR: WSO2
PRODUCT: Universal Gateway, Traffic Manager, API Control Plane, API Manager
AFFECTED_VERSIONS: See vendor advisory for specific affected versions
CONFIDENCE: high
MISSING: none
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Description Summary:
The throttling event handling mechanism in multiple WSO2 products fails to properly validate user-supplied JSON payloads, leading to potential denial-of-service conditions.
Executive Summary:
Improper validation of JSON payloads in WSO2 product throttling mechanisms allows unauthenticated attackers to cause a denial-of-service condition.
Vulnerability Details
CVE-ID: CVE-2026-4249
Affected Software: WSO2 Universal Gateway, Traffic Manager, API Control Plane, and API Manager
Affected Versions: Multiple versions, including WSO2 API Manager 3.2.0 through 4.5.0 and associated gateway/control plane components. Please refer to the vendor advisory for specific patch levels.
Vulnerability: The vulnerability (CWE-707) exists in the throttling event handling mechanism. An unauthenticated attacker can send malformed or malicious JSON payloads that bypass validation, resulting in system instability or a denial-of-service (A).
Business Impact
With a CVSS score of 8.6, this vulnerability poses a significant risk to the availability of critical API infrastructure. Successful exploitation could paralyze API management and traffic routing capabilities, leading to widespread service outages for any applications relying on the WSO2 gateway, resulting in severe business disruption.
Remediation Plan
Immediate Action: Apply the specific security updates provided by WSO2 for your respective product version as detailed in the official security advisory.
Proactive Monitoring: Monitor API Manager and Gateway logs for malformed JSON requests or unexpected error spikes within the throttling event handling processes.
Compensating Controls: Utilize a Web Application Firewall (WAF) to inspect and filter incoming JSON traffic for structural anomalies before it reaches the WSO2 throttling engine.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of July 7, 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
The reliance on WSO2 for API management makes this a high-priority update. Administrators should immediately audit their WSO2 environments against the provided advisory and apply the necessary patches to prevent potential service-impacting attacks.