Cisco Secure Endpoint ClamAV CSS Parsing DoS (cisco-sa-clamav-css-Fn4QSZ)

medium Nessus Plugin ID 302191

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, Cisco Secure Endpoint is affected by a denial of service (DoS) vulnerability.

- A vulnerability in the HTML Cascading Style Sheets (CSS) module 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 improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process. (CVE-2026-20031)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwr70252, CSCwr70255, CSCwr70268.

Plugin Details

Severity: Medium

ID: 302191

File Name: cisco-sa-clamav-css-Fn4QSZ.nasl

Version: 1.1

Type: local

Family: CISCO

Published: 3/13/2026

Updated: 3/13/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS Score Source: CVE-2026-20031

CVSS v3

Risk Factor: Medium

Base Score: 5.3

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

Vulnerability Information

CPE: cpe:/a:cisco:secure_endpoint

Patch Publication Date: 3/4/2026

Vulnerability Publication Date: 3/4/2026

Reference Information

CVE: CVE-2026-20031

CWE: 248

CISCO-SA: cisco-sa-clamav-css-Fn4QSZ

IAVA: 2026-A-0209

CISCO-BUG-ID: CSCwr70252, CSCwr70255, CSCwr70268

Detections

Analytics