CVE-2025-34335
8.8 · HIGHOverview
CVE-2025-34335 is a high-severity vulnerability affecting audiocodes fax_server. It was published on November 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 expose an authenticated command injection vulnerability in the license activation workflow handled by AudioCodes_files/ActivateLicense.php. When a license file is uploaded, the application derives a new filename by combining a generated base name with the attacker-controlled extension portion of the original upload name, then constructs a command line for fax_server_lic_cmdline.exe that includes this path. The extension value is incorporated into the command string without input validation, escaping, or proper argument quotation before being passed to exec(). An authenticated user with access to the license upload interface can supply a specially crafted filename whose extension injects additional shell metacharacters, causing arbitrary commands to be executed as NT AUTHORITY\\SYSTEM.
Remediation
Check the references section for vendor advisories and patches from audiocodes. Update fax_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| audiocodes | fax_server | 0 | Affected |
| audiocodes | interactive_voice_response | >= 0, < 2.6.23 | Affected |
References
Frequently Asked Questions
What is CVE-2025-34335?
CVE-2025-34335 is a high-severity vulnerability affecting audiocodes fax_server. It was published on November 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2025-34335?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-34335?
Check the references section for vendor advisories and patches from audiocodes. Update fax_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-34335?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-34335 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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