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CVE-2025-20234: ClamAV UDF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-06-17
• Weakness: CWE-125

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 .

Affected products

• Cisco Secure Endpoint: before 1.26.1; before 7.5.21; from 8.0.1.21160 before 8.4.5 — fixed in 1.26.1, 7.5.21, 8.4.5
• Cisco Secure Endpoint Private Cloud: before 4.2.2 — fixed in 4.2.2
• Cisco ClamAV: from 1.2.0 before 1.4.3 — fixed in 1.4.3

How to fix

Upgrade to a fixed version: Cisco Secure Endpoint 1.26.1, 7.5.21, 8.4.5; Cisco Secure Endpoint Private Cloud 4.2.2; Cisco ClamAV 1.4.3. Check the vendor advisory for mitigations.

References

• https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy

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