CVE-2025-34329

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.

Affected products

Audiocodes Fax Server, Auto-Attendant Ivr

Audiocodes Fax Server

≤ 2.6.23

Audiocodes Interactive Voice Response

≤ 2.6.23

Fix

Available

CVSS 3.1

9.8 CRITICAL

EPSS

1.1% (64th percentile)

Weakness

CWE-434

NVD status

Analyzed

Published

2025-11-19