PT-2025-47477 · Audiocodes · Audiocodes Fax Server+1

Pierre Barre · Published 2025-11-19 · Updated 2025-11-19 · CVE-2025-34328

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23

Description The web administration component (F2MAdmin) includes an unauthenticated script-management endpoint at /AudioCodes files/utils/IVR/diagram/ajaxScript.php. The saveScript action within this endpoint allows writing attacker-supplied data directly to a file path on the server, running with NT AUTHORITYSYSTEM privileges on Windows. This enables a remote, unauthenticated attacker to write arbitrary files into the product’s web-accessible directory structure and subsequently execute them.

Recommendations Versions prior to 2.6.23 should be updated.

Exploit

Fix

RCE

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2025-34328

Affected Products

Audiocodes Fax Server

Auto-Attendant Ivr

References · 8

• 🔥 https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt · Exploit
• 🔥 https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html · Exploit
• https://osv.dev/vulnerability/CVE-2025-34328 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-34328 · Security Note
• https://vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticated-file-upload-rce-via-ajaxscript · Note
• https://twitter.com/0dayPublishing/status/1991233750881939471 · Twitter Post
• https://audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf · Patch, Vendor Advisory
• https://twitter.com/CVEnew/status/1991187286814490700 · Twitter Post