Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Audiocodes | Fax Server | <= 2.6.23 |
| Audiocodes | Interactive Voice Response | <= 2.6.23 |
Related Weaknesses (CWE)
References
- https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txtExploitThird Party Advisory
- https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilitiesExploitThird Party Advisory
- https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-forProduct
- https://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticateThird Party Advisory
FAQ
What is CVE-2025-34328?
CVE-2025-34328 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2025-34328?
CVE-2025-34328 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-34328?
Check the references section above for vendor advisories and patch information. Affected products include: Audiocodes Fax Server, Audiocodes Interactive Voice Response.