AudioCodes Fax Server/Auto-Attendant IVR up to 2.6.23 License Upload Interface ActivateLicense.php os command injection

Summaryinfo

A vulnerability was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. It has been classified as critical. This affects an unknown function of the file AudioCodes_files/ActivateLicense.php of the component License Upload Interface. Performing a manipulation results in os command injection. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is reported as CVE-2025-34335. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. This affects an unknown code block of the file AudioCodes_files/ActivateLicense.php of the component License Upload Interface. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Pierre Barre. It is possible to read the advisory at audiocodes.com. This vulnerability is uniquely identified as CVE-2025-34335 since 04/15/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/12/2025). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

By approaching the search of inurl:AudioCodes_files/ActivateLicense.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• AudioCodes

Name

• Auto-Attendant IVR
• Fax Server

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3
• 2.6.4
• 2.6.5
• 2.6.6
• 2.6.7
• 2.6.8
• 2.6.9
• 2.6.10
• 2.6.11
• 2.6.12
• 2.6.13
• 2.6.14
• 2.6.15
• 2.6.16
• 2.6.17
• 2.6.18
• 2.6.19
• 2.6.20
• 2.6.21
• 2.6.22
• 2.6.23

Support

• end of life

CPE 2.3info

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CPE 2.2info

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