AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 expose an unauthenticated backup upload endpoint at AudioCodes_files/ajaxBackupUploadFile.php in the F2MAdmin web interface. The script derives a backup folder path from application configuration, creates the directory if it does not exist, and then moves an uploaded file to that location using the attacker-controlled filename, without any authentication, authorization, or file-type validation. On default Windows deployments where the backup directory resolves to the system drive, a remote attacker can upload web server or interpreter configuration files that cause a log file or other server-controlled resource to be treated as executable code. This allows subsequent HTTP requests to trigger arbitrary command execution under the web server account, which runs as NT AUTHORITY\\SYSTEM.
Advisories

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Fixes

Solution

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Workaround

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History

Fri, 12 Dec 2025 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Audiocodes fax Server
Audiocodes interactive Voice Response
CPEs cpe:2.3:a:audiocodes:fax_server:*:*:*:*:*:*:*:*
cpe:2.3:a:audiocodes:interactive_voice_response:*:*:*:*:*:*:*:*
Vendors & Products Audiocodes fax Server
Audiocodes interactive Voice Response
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Thu, 20 Nov 2025 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Audiocodes
Audiocodes fax\/ivr
CPEs cpe:2.3:h:audiocodes:fax\/ivr:*:*:*:*:*:*:*:*
Vendors & Products Audiocodes
Audiocodes fax\/ivr

Wed, 19 Nov 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 19 Nov 2025 16:45:00 +0000

Type Values Removed Values Added
Description AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 expose an unauthenticated backup upload endpoint at AudioCodes_files/ajaxBackupUploadFile.php in the F2MAdmin web interface. The script derives a backup folder path from application configuration, creates the directory if it does not exist, and then moves an uploaded file to that location using the attacker-controlled filename, without any authentication, authorization, or file-type validation. On default Windows deployments where the backup directory resolves to the system drive, a remote attacker can upload web server or interpreter configuration files that cause a log file or other server-controlled resource to be treated as executable code. This allows subsequent HTTP requests to trigger arbitrary command execution under the web server account, which runs as NT AUTHORITY\\SYSTEM.
Title AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated Backup Upload RCE via ajaxBackupUploadFile.php
Weaknesses CWE-434
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2025-11-20T15:21:16.647Z

Reserved: 2025-04-15T19:15:22.586Z

Link: CVE-2025-34329

cve-icon Vulnrichment

Updated: 2025-11-19T16:48:57.715Z

cve-icon NVD

Status : Analyzed

Published: 2025-11-19T17:15:47.613

Modified: 2025-12-12T16:09:44.737

Link: CVE-2025-34329

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses