High 8.7Published Nov 19, 2025

CVE-2025-34335AudioCodes Fax/IVR Appliance <= 2.6.23 Authenticated Command Injection via ActivateLicense.php

Updated under an hour ago (Oct 27, 2026, 5:30 AM ET)

Does this affect you?

It affects AudioCodes Limited AudioCodes Fax/IVR Appliance and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for AudioCodes Limited AudioCodes Fax/IVR Appliance

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Nov 20, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AudioCodes Limited AudioCodes Fax/IVR Appliance audiocodes:fax_ivr_appliance (from the name)	through 2.6.23	CNA record
audiocodes fax_server audiocodes:fax_server	through 2.6.23	NVD
audiocodes interactive_voice_response audiocodes:interactive_voice_response	before 2.6.23	NVD

References

References

https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf	vendor-advisory, patch, mitigation, product
https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html	technical-description, exploit, third-party-advisory
https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt	technical-description, exploit, third-party-advisory
https://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-authenticated-command-injection-via-activatelicense	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.