CVE-2025-34333: fax server Permission Flaw — Exploit

Description

AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 configure the web document root at C:\\F2MAdmin\\F2E with overly permissive file system permissions. Authenticated local users have modify rights on this directory, while the associated web server process runs as NT AUTHORITY\\SYSTEM. As a result, any local user can create or alter server-side scripts within the webroot and then trigger them via HTTP requests, causing arbitrary code to execute with SYSTEM privileges.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-276 Incorrect Default Permissions

Affected Products

Vendor	Product	Versions
audiocodes	fax_server	< 2.6.23
audiocodes	interactive_voice_response	< 2.6.23

References

Exploits

https://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt https://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html

Other References

https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf https://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-world-writable-webroot-lpe

Frequently Asked Questions

What is CVE-2025-34333? +

AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 configure the web document root at C:\\F2MAdmin\\F2E with overly permissive file system permissions. Authenticated local users have modify rights on this directory, while the associated web server process runs as NT AUTHORITY\\SYSTEM. As a result, any local user can create or alter server-side scripts within the webroot and then trigger them via HTTP requests, causing arbitrary code to execute with SYSTEM privileges. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-34333? +

CVE-2025-34333 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-34333? +

CVE-2025-34333 affects products from audiocodes, specifically: fax_server, interactive_voice_response. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-34333? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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