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CVE-2025-20234

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Date: June 18, 2025

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 .

Severity Score

Related Resources (5)

https://security-tracker.debian.org/tracker/CVE-2025-20234
https://nvd.nist.gov/vuln/detail/CVE-2025-20234
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
https://www.mend.io/vulnerability-database/CVE-2025-20234

Severity Score

Weakness Type (CWE)

Out-of-bounds Read

CWE-125

Top Fix

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Upgrade Version

Upgrade to version https://github.com/Cisco-Talos/clamav.git - clamav-1.4.3

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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