CVE-2025-34329Public exploitNetwork attack vector

Unauthenticated RCE via unrestricted backup file upload

Published Nov 19, 2025 · Updated Nov 20, 2025

Unrestricted file upload in AudioCodes Fax Server and Auto Attendant IVR 2.6.23 and earlier allows remote attackers to execute commands. The unauthenticated ajaxBackupUploadFile.php handler appends an attacker-controlled basename to the configured backup path and moves the upload without validating its type. On default Windows deployments, a configuration file can make Apache interpret attacker-influenced log content as code, yielding NT AUTHORITY\SYSTEM execution.

CVSS severity9.3
Critical
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in AudioCodes Fax Server and Auto Attendant IVR 2.6.23 and earlier allows remote attackers to execute commands. The unauthenticated ajaxBackupUploadFile.php handler appends an attacker-controlled basename to the configured backup path and moves the upload without validating its type. On default Windows deployments, a configuration file can make Apache interpret attacker-influenced log content as code, yielding NT AUTHORITY\SYSTEM execution.

The record

CVE
CVE-2025-34329
Published
Nov 19, 2025
Updated
Nov 20, 2025
Vendor
AudioCodes Ltd.
Product
Fax Server and Auto Attendant IVR
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

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

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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 privilegesunauthenticated

What is affected?

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

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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