AudioCodes Fax Server/Auto-Attendant IVR up to 2.6.23 on Windows ajaxScript.php unrestricted upload

Summaryinfo

A vulnerability has been found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23 on Windows and classified as critical. The affected element is an unknown function of the file AudioCodes_files/utils/IVR/diagram/ajaxScript.php. This manipulation causes unrestricted upload. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is registered as CVE-2025-34328. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23 on Windows. Affected by this vulnerability is an unknown part of the file AudioCodes_files/utils/IVR/diagram/ajaxScript.php. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect 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 include a web administration component (F2MAdmin) that exposes an unauthenticated script-management endpoint at AudioCodes_files/utils/IVR/diagram/ajaxScript.php. The saveScript action writes attacker-supplied data directly to a server-side file path under the privileges of the web service account, which runs as NT AUTHORITY\\SYSTEM on Windows deployments. A remote, unauthenticated attacker can write arbitrary files into the product’s web-accessible directory structure and subsequently execute them.

The weakness was published by Pierre Barre. The advisory is shared at audiocodes.com. This vulnerability is known as CVE-2025-34328 since 04/15/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/12/2025). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

By approaching the search of inurl:AudioCodes_files/utils/IVR/diagram/ajaxScript.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.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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