CVE-2025-34334Public exploitNetwork attack vector

SYSTEM command execution via unsanitized fax parameters

Published Nov 19, 2025 · Updated Nov 20, 2025

OS command injection in AudioCodes Fax Server and Auto Attendant IVR 2.6.23 and earlier allows remote authenticated users to execute commands. TestFax.php inserts unvalidated fax-number and source-IP request values into a faxsender command passed to GlobalUtils::RunBatchFile. Access to the fax test interface is required remotely; writable pending batch files also let local users execute commands as SYSTEM.

CVSS severity8.7
High
EPSS probability3.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in AudioCodes Fax Server and Auto Attendant IVR 2.6.23 and earlier allows remote authenticated users to execute commands. TestFax.php inserts unvalidated fax-number and source-IP request values into a faxsender command passed to GlobalUtils::RunBatchFile. Access to the fax test interface is required remotely; writable pending batch files also let local users execute commands as SYSTEM.

The record

CVE
CVE-2025-34334
Published
Nov 19, 2025
Updated
Nov 20, 2025
Vendor
AudioCodes Ltd.
Product
Fax Server and Auto Attendant IVR
Classifications
CWE-78, T1059.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.6.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

AudioCodes Ltd. · Fax Server and Auto Attendant IVRversion=0 <=2.6.23

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.003Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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