CVE-2025-20234

Name: CVE-2025-20234
Creator: NVD / NIST
Published: 2025-06-18T17:15:28.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2025-20234 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process, resulting in a DoS condition on the affected software. For a description of this vulnerability, see the .

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.66%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Clamav	Clamav	>= 1.2.0, < 1.4.3
Cisco	Secure Endpoint	< 1.26.1
Cisco	Secure Endpoint	< 7.5.21
Cisco	Secure Endpoint	>= 8.0.1.21160, < 8.4.5
Cisco	Secure Endpoint Private Cloud	< 4.2.2

References

https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.htmlVendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDyThird Party Advisory

Timeline

Published: Jun 18, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-20234?

How severe is CVE-2025-20234?

CVE-2025-20234 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2025-20234?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-20234?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST