Audiocodes · Auto-Attendant Ivr · CVE-2025-34329
**Name of the Vulnerable Software and Affected Versions**
AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23
**Description**
The software contains an unauthenticated backup upload endpoint located at `/AudioCodes files/ajaxBackupUploadFile.php` within the F2MAdmin web interface. The script determines a backup folder path from the application configuration, creates the directory if it doesn't exist, and then moves an uploaded file to that location using the attacker-controlled filename, without any authentication, authorization, or file-type validation. On default Windows deployments where the backup directory resolves to the system drive, a remote attacker can upload web server or interpreter configuration files. This can cause a log file or other server-controlled resource to be treated as executable code, allowing subsequent HTTP requests to trigger arbitrary command execution under the web server account, which runs as NT AUTHORITYSYSTEM.
**Recommendations**
Versions prior to 2.6.23 should be updated.