How severe is CVE-2025-34328?

CVE-2025-34328 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-34328 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34328?

CVE-2025-34328 primarily affects Audiocodes Fax Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-34328?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-34328 have an EU (EUVD) identifier?

Yes. CVE-2025-34328 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198196.

When was CVE-2025-34328 published?

CVE-2025-34328 was published on 2025-11-19 and last updated on 2026-06-17.

CVE-2025-34328

CVE-2025-34328 is a critical-severity vulnerability in Audiocodes Fax Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198196
Weakness: CWE-434
Affected product: Audiocodes Fax Server
Published: 2025-11-19
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-34328?: 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.
How severe is CVE-2025-34328?: CVE-2025-34328 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-34328 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34328?: CVE-2025-34328 primarily affects Audiocodes Fax Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-34328?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-34328 have an EU (EUVD) identifier?: Yes. CVE-2025-34328 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198196.
When was CVE-2025-34328 published?: CVE-2025-34328 was published on 2025-11-19 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:audiocodes:fax_server:*:*:*:*:*:*:*:*
cpe:2.3:a:audiocodes:interactive_voice_response:*:*:*:*:*:*:*:*

More vulnerabilities in Audiocodes Fax Server

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