AudioCodes Fax Server/Auto-Attendant IVR up to 2.6.23 ajaxPromptUploadFile.php unrestricted upload

Summaryinfo

A vulnerability was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23 and classified as critical. The impacted element is an unknown function of the file AudioCodes_files/utils/IVR/diagram/ajaxPromptUploadFile.php. Such manipulation leads to unrestricted upload. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is documented as CVE-2025-34330. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. Affected by this issue is an unknown code of the file AudioCodes_files/utils/IVR/diagram/ajaxPromptUploadFile.php. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 prompt upload endpoint at AudioCodes_files/utils/IVR/diagram/ajaxPromptUploadFile.php. The script accepts an uploaded file and writes it into the C:\\F2MAdmin\\tmp directory using a filename derived from application constants, without any authentication, authorization, or file-type validation. A remote, unauthenticated attacker can upload or overwrite prompt- or music-on-hold–related files in this directory, potentially leading to tampering with IVR audio content or preparing files for use in further attacks.

The weakness was released by Pierre Barre. The advisory is available at audiocodes.com. This vulnerability is handled as CVE-2025-34330 since 04/15/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/12/2025). This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

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

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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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