ClamAV 0.99.4 < 1.0.9, 1.2.0 < 1.4.3 Multiple Vulnerabilities

critical Nessus Plugin ID 241516

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Synopsis

The antivirus running on the remote host is affected by multiple vulnerabilities.

Description

According to its version, the ClamAV clamd antivirus daemon running on the remote host is 0.99.4 prior to 1.0.9, 1.2.0 prior to 1.4.3. It is, therefore, affected by multiple vulnerabilities:

- 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. (CVE-2025-20234)

- A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process. (CVE-2025-20260)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to ClamAV version 1.0.9, 1.4.3 or later.

Plugin Details

Severity: Critical

ID: 241516

File Name: clamav_1_4_3.nasl

Version: 1.1

Type: combined

Family: Misc.

Published: 7/8/2025

Updated: 7/8/2025

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2025-20260

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:clamav:clamav

Required KB Items: installed_sw/ClamAV

Patch Publication Date: 6/18/2025

Vulnerability Publication Date: 6/18/2025

Reference Information

CVE: CVE-2025-20234, CVE-2025-20260

IAVB: 2025-B-0098

Detections

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