Arbitrary file upload in Audiocodes Fax Server
CVE-2025-34330
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 prompt upload endpoint at AudioCodes_files/utils/IVR/diagram/ajaxPromptUploadFile.php. The script accepts an uploaded file and writes it into the C:\\F2MAdmin\\tmp directory using a filename derived from application constants, without any authentication, authorization, or file-type validation. A remote, unauthenticated attacker can upload or overwrite prompt- or music-on-hold–related files in this directory, potentially leading to tampering with IVR audio content or preparing files for use in further attacks.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audioc… (Product, vendor-advisory, patch, mitigation)
- pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html (Exploit, technical-description, Third Party Advisory, exploit)
- pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt (Exploit, technical-description, Third Party Advisory, exploit)
- www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticated-promp… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34330?
- CVE-2025-34330 is a medium-severity vulnerability in Audiocodes Fax Server, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.3/10. Published 2025-11-19.
- How severe is CVE-2025-34330?
- Medium severity. CVSS v3 base score is 5.3 out of 10.