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.
References
| Link | Resource |
|---|---|
| https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt | Exploit Third Party Advisory |
| https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html | Exploit Third Party Advisory |
| https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf | Product |
| https://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticated-backup-upload-rce-via-ajaxbackupuploadfile | Third Party Advisory |
Configurations
Configuration 1 (hide)
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History
12 Dec 2025, 16:09
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Audiocodes interactive Voice Response
Audiocodes Audiocodes fax Server |
|
| CPE | cpe:2.3:a:audiocodes:fax_server:*:*:*:*:*:*:*:* cpe:2.3:a:audiocodes:interactive_voice_response:*:*:*:*:*:*:*:* |
|
| References | () https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt - Exploit, Third Party Advisory | |
| References | () https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html - Exploit, Third Party Advisory | |
| References | () https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf - Product | |
| References | () https://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticated-backup-upload-rce-via-ajaxbackupuploadfile - Third Party Advisory | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.8 |
19 Nov 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-11-19 17:15
Updated : 2025-12-12 16:09
NVD link : CVE-2025-34329
Mitre link : CVE-2025-34329
CVE.ORG link : CVE-2025-34329
JSON object : View
Products Affected
audiocodes
- interactive_voice_response
- fax_server
CWE
CWE-434
Unrestricted Upload of File with Dangerous Type