CVE-2025-20234

Publication date 18 June 2025

Last updated 13 August 2025

Ubuntu priority

Cvss 3 Severity Score

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 .

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
clamav	25.04 plucky	Fixed 1.4.3+dfsg-0ubuntu0.25.04.1
	24.10 oracular	Fixed 1.4.3+dfsg-0ubuntu0.24.10.1
	24.04 LTS noble	Fixed 1.4.3+dfsg-0ubuntu0.24.04.1
	22.04 LTS jammy	Fixed 1.4.3+dfsg-0ubuntu0.22.04.1
	20.04 LTS focal	Fixed 1.4.3+dfsg-0ubuntu0.20.04.1+esm1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

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Notes

iconstantin

this issue was introduced in version 1.2.0 of clamav.

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L