A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond expr ..." tests evaluating as "true". This flaw could lead to unintended behavior in web server operations, potentially affecting the integrity of request processing and access controls.
The vulnerability has been classified with a CVSS score of 6.3, placing it in the medium severity category. Such a rating indicates that while the vulnerability is not critical, it poses a risk that organizations should not overlook.
Risk to organizations includes potential disruptions in service functionality and unauthorized access scenarios. Given the widespread deployment of Apache HTTP Server, the implications of this flaw could affect numerous web applications.
Organizations should prioritize patching immediately. Users are recommended to upgrade to version 2.4.65, which fixes the issue.
Vulnerability Details
The vulnerability allows for all "RewriteCond expr ..." tests to erroneously evaluate as "true". This bug has been officially acknowledged by the Apache Software Foundation.
The CWE classification for this issue is CWE-253, which relates to improper check for unusual or exceptional conditions.
Affected systems are those running Apache HTTP Server version 2.4.64. The vulnerability was published on July 23, 2025.
Technical Analysis
The root cause of this vulnerability is a flaw in the evaluation logic for the "RewriteCond expr" directive. This bug can be exploited through a network attack vector, requiring low complexity and low privileges to trigger. No user interaction is necessary.
The impact on confidentiality, integrity, and availability is rated as low, but could lead to significant operational issues if not addressed.
Risk & Impact Analysis
Real-world deployment of Apache HTTP Server may expose organizations to unauthorized access or misconfiguration scenarios resulting from this vulnerability. The blast radius could extend to all services relying on the affected version, making it a critical concern for web administrators.
Organizations should assess their environments for the presence of Apache HTTP Server version 2.4.64 and implement the recommended upgrade to mitigate potential risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The specific version affected by this vulnerability is Apache HTTP Server 2.4.64. Organizations using this version should upgrade to 2.4.65 to resolve the issue.
Mitigation & Remediation
To remediate this vulnerability, users should upgrade their Apache HTTP Server to version 2.4.65 or later. If immediate upgrades are not feasible, organizations should review their server configurations for potential vulnerabilities and restrict access to critical functionalities.
For continuous security assessment, consider engaging in continuous penetration testing to identify and mitigate similar vulnerabilities.
Detection Guidance
Monitor logs for unusual patterns related to the RewriteCond directive. Look for signs of misconfiguration and unauthorized access attempts that may result from this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of maintaining updated software versions. Security teams should implement regular patch management practices to minimize exposure to known vulnerabilities.
Organizations are encouraged to develop a comprehensive vulnerability management program that includes proactive scanning and monitoring to stay ahead of potential threats.
For detailed insights on security testing best practices, refer to our guide on penetration testing methodology.
Lastly, developing a robust security posture is crucial in mitigating risks associated with vulnerabilities like CVE-2025-54090.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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