CVE-2025-34329 AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated Backup Upload RCE via ajaxBackupUploadFile.php
Remote attackers can upload malicious files to the unauthenticated backup endpoint, leading to arbitrary code execution with SYSTEM privileges on AudioCodes appliances.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-34329?
CVE-2025-34329 is a critical vulnerability in AudioCodes Fax/IVR Appliance, published on 19 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 expose an unauthenticated backup upload endpoint at AudioCodes_files/ajaxBackupUploadFile.php in the F2MAdmin web interface. The script derives a backup folder path from application configuration, creates the directory if it does not 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 that cause a log file or other server-controlled resource to be treated as executable code. This allows subsequent HTTP requests to trigger arbitrary command execution under the web server account, which runs as NT AUTHORITY\\SYSTEM.
Weakness: CWE-434
Which versions are affected by CVE-2025-34329?
It affects 2 products.
Products include Audiocodes Fax Server, Audiocodes Interactive Voice Response.
How do I fix CVE-2025-34329?
No fix has been published for CVE-2025-34329 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-34329 being exploited?
There is no known exploitation of CVE-2025-34329 in the wild and no public exploit code.
Other vulnerabilities in AudioCodes Fax/IVR Appliance
- CVE-2025-34328 AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated File Upload RCE via ajaxScript.php
- CVE-2025-34331 AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated File Read via download.php
- CVE-2025-34334 AudioCodes Fax/IVR Appliance <= 2.6.23 Authenticated Command Injection via TestFax.php & LPE
- CVE-2025-34335 AudioCodes Fax/IVR Appliance <= 2.6.23 Authenticated Command Injection via ActivateLicense.php
- CVE-2025-34332 AudioCodes Fax/IVR Appliance <= 2.6.23 Insecure Service Control Scripts LPE
Sources
Also known as GHSA-x988-43fg-2vcq.