CVE-2026-20031: Cisco Secure Endpoint

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Cisco Secure Endpoint: version 7.0.5 only; version 6.2.19 only; version 7.3.3 only; version 7.2.13 only; version 6.1.5 only; version 6.3.1 only; …

Published 2026-03-04. Last modified 2026-06-17.