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Fax ServerApplication · Audiocodes

CVE-2025-34328

CRITICAL · 9.8 CVSS v3.1 Published 2025-11-19
Fix available
A fix is available. Upgrade to after 2.6.23 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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 script-management endpoint at AudioCodes_files/utils/IVR/diagram/ajaxScript.php. The saveScript action writes attacker-supplied data directly to a server-side file path under the privileges of the web service account, which runs as NT AUTHORITY\\SYSTEM on Windows deployments. A remote, unauthenticated attacker can write arbitrary files into the product’s web-accessible directory structure and subsequently execute them.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

AudioCodes Fax Server and IVR appliances up to version 2.6.23 contain an unauthenticated file-write vulnerability in the F2MAdmin web component's ajaxScript.php endpoint. The saveScript action permits a remote, unauthenticated attacker to write arbitrary files to the web-accessible directory, which are subsequently executable. The web service runs as NT AUTHORITY\SYSTEM, providing full system compromise.

MitigationImmediately restrict network access to the F2MAdmin web interface using firewall rules or disable the component if unnecessary. Monitor for indicators of compromise and apply vendor-supplied patches when available.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Fax ServerApplication
Affected:<= 2.6.23
Interactive Voice ResponseApplication
Affected:<= 2.6.23

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify product and version
    Locate the installed version of AudioCodes Fax Server or AudioCodes Interactive Voice Response (IVR) via the administrative interface, system information, or installed programs list.
    Affected if The product is AudioCodes Fax Server or IVR with version 2.6.23 or lower.
  2. Locate F2MAdmin web component
    Search the web server directories for the F2MAdmin folder and specifically the ajaxScript.php file.
    Affected if The ajaxScript.php file exists in a web-accessible directory under the F2MAdmin component.
  3. Verify F2MAdmin is exposed
    Determine if the F2MAdmin web interface is accessible from the network by attempting to access the URL or reviewing firewall/network configurations.
    Affected if The F2MAdmin endpoint is reachable over the network without authentication.
  4. Confirm saveScript action is enabled
    Inspect the ajaxScript.php configuration or attempt a request to the saveScript action endpoint to verify it accepts unauthenticated requests.
    Affected if The saveScript action accepts requests without requiring authentication.

A user is affected if they are running AudioCodes Fax Server or IVR version 2.6.23 or lower with the F2MAdmin web component exposed to the network and the ajaxScript.php saveScript action enabled and accessible without authentication.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 2.6.23
Interim mitigation

Immediately restrict network access to the F2MAdmin web interface using firewall rules or disable the component if unnecessary. Monitor for indicators of compromise and apply vendor-supplied patches when available.

Recommended fix Moderate confidence

Version greater than 2.6.23 (contact AudioCodes for exact patched release)

  1. 1. Identify the current version of AudioCodes Fax Server or Interactive Voice Response (IVR) by accessing the web administration interface or checking system information.
  2. 2. Contact AudioCodes technical support or visit the official AudioCodes support portal to obtain the patched version that addresses CVE-2025-34328.
  3. 3. Download the updated firmware/software version from AudioCodes official channels.
  4. 4. Follow AudioCodes documented upgrade procedures, ensuring to backup configuration settings before applying the update.
  5. 5. After upgrading, verify that the vulnerable endpoint (AudioCodes_files/utils/IVR/diagram/ajaxScript.php) is either removed, patched, or requires authentication.
  6. 6. Confirm the new version is running and the vulnerability is remediated.
Caveat Review release notes for any configuration or feature changes between current version and the patched release

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Fax Server Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-34328 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data