CVE-2025-34331: AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 contain an unauthe

Q: How do I fix CVE-2025-34331?

fax server: upgrade to newer than 2.6.23; interactive voice response: upgrade to newer than 2.6.23. Exact commands for each OS are on this page.

Q: Is CVE-2025-34331 being exploited?

CVE-2025-34331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-34331 affect?

CVE-2025-34331 affects fax server, interactive voice response. Severity is high (CVSS 7.5). AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 contain an unauthenticated file read vulnerability via the download.php script. The endpoint exposes a file download mechanism that lacks access con

Q: How urgent is CVE-2025-34331?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2025-34331 is a high-severity flaw (CVSS 7.5) affecting fax server, interactive voice response. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 contain an unauthenticated file read vulnerability via the download.php script. The endpoint exposes a file download mechanism that lacks access control, allowing remote, unauthenticated users to request files stored on the appliance based solely on attacker-supplied path and filename parameters. While limited to specific file extensions permitted by the a

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-11-19
Last modified	2026-10-18

Publisher (CNA): VulnCheck · Vendor: audiocodes

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-19 17:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

audiocodes fax server UPGRADE

Affected: <= 2.6.23

Fixed in: newer than 2.6.23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fax-server || rpm -q fax-server || fax-server --version

2. UPGRADE to newer than 2.6.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fax-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fax-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

audiocodes interactive voice response UPGRADE

Affected: <= 2.6.23

Fixed in: newer than 2.6.23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy interactive-voice-response || rpm -q interactive-voice-response || interactive-voice-response --version

2. UPGRADE to newer than 2.6.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade interactive-voice-response

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade interactive-voice-response

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34331?

fax server: upgrade to newer than 2.6.23; interactive voice response: upgrade to newer than 2.6.23. Exact commands for each OS are on this page.

Is CVE-2025-34331 being exploited?

CVE-2025-34331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34331 affect?

CVE-2025-34331 affects fax server, interactive voice response. Severity is high (CVSS 7.5). AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 contain an unauthenticated file read vulnerability via the download.php script. The endpoint exposes a file download mechanism that lacks access con

How urgent is CVE-2025-34331?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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