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CVE-2025-34328

AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated File Upload RCE via ajaxScript.php

Published: Nov 19, 2025Updated: Dec 12, 2025 Sources: CVE List NVDCWE-434
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.6%
Top 55.0%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-434

Affected Products

AudioCodes Fax/IVR ApplianceAudioCodes Limited
Embedded
Communications
fax serveraudiocodes
On-prem
Communications / voip-telephony
interactive voice responseaudiocodes
On-prem
Communications / voip-telephony
audiocodes limitedcommercialCommunicationsaka audiocodes
audiocodescommercialILCommunicationsaka audiocodes

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Persistence
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References

https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf
audiocodes.com
https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html
pierrekim.github.io
https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt
pierrekim.github.io
and 1 more references View all →

Timeline

Published
Nov 19, 2025
Last Updated
Dec 12, 2025

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