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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 is a vulnerability identified in the HTML Cascading Style Sheets (CSS) module of ClamAV, which is integrated into Cisco Secure Endpoint. The root cause is improper error handling during the splitting of UTF-8 encoded strings. When ClamAV scans files, it processes HTML content including CSS. An attacker can craft a malicious HTML file with specially constructed UTF-8 sequences that trigger an uncaught exception in the CSS module. This exception causes the scanning process to terminate unexpectedly, resulting in a denial of service (DoS) condition on the affected device. The vulnerability does not require any authentication or user interaction, making it remotely exploitable by anyone able to submit files for scanning. The impact is limited to availability, as the scanning process stops, potentially allowing malware to bypass detection temporarily. The vulnerability affects a wide range of Cisco Secure Endpoint versions, spanning multiple major releases, indicating that many organizations could be vulnerable. No known exploits have been reported in the wild as of the publication date. The CVSS v3.1 base score is 5.3 (medium), reflecting the ease of exploitation and limited impact on confidentiality and integrity. The vulnerability was reserved in October 2025 and published in March 2026. No patches or mitigations were linked in the provided data, suggesting that organizations should monitor Cisco advisories closely for updates.

Detailed information about CVE-2026-20031: Uncaught Exception in Cisco Cisco Secure Endpoint affecting Cisco Cisco Secure Endpoint. Get real-time updates, techn

CVE-2026-20031: Uncaught Exception in Cisco Cisco Secure Endpoint - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20031: Uncaught Exception in Cisco Cisco Secure Endpoint

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