CVE-2025-34335
HighCVSS 8.8Exploitation Probability (EPSS)
High risk86th percentile - higher than 86% of all known CVEs
Summary
AudioCodes Fax Server and Auto-Attendant IVR appliances up to and including 2.6.23 expose an authenticated command injection in the license activation workflow handled by AudioCodes_files/ActivateLicense.php. The extension of the uploaded license filename is incorporated into a command line without validation, allowing an authenticated user to execute arbitrary commands as NT AUTHORITY\SYSTEM.
Risk Assessment
A user with access to the license upload interface can execute arbitrary commands with SYSTEM privileges, leading to full compromise of the appliance.
Recommendation
Upgrade AudioCodes appliances to a version later than 2.6.23 or apply the vendor patch, and restrict access to the license activation interface.
Other vulnerabilities in AudioCodes Fax Server and Auto-Attendant IVR
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS