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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Secure Endpoint unknown
Version Status Constraints
7.0.5 affected —
6.2.19 affected —
7.3.3 affected —
7.2.13 affected —
6.1.5 affected —
6.3.1 affected —
6.2.5 affected —
7.3.5 affected —
6.2.1 affected —
7.2.7 affected —
7.1.1 affected —
6.3.5 affected —
6.2.9 affected —
7.3.1 affected —
6.1.7 affected —
7.2.11 affected —
7.2.3 affected —
7.1.5 affected —
6.3.3 affected —
7.3.9 affected —
6.2.3 affected —
6.1.9 affected —
6.0.9 affected —
7.2.5 affected —
6.0.7 affected —
6.3.7 affected —
1.12.3 affected —
1.8.0 affected —
1.11.1 affected —
1.12.4 affected —
1.10.0 affected —
1.12.0 affected —
1.8.1 affected —
1.10.1 affected —
1.12.1 affected —
1.12.6 affected —
1.14.0 affected —
1.10.2 affected —
1.12.7 affected —
1.12.2 affected —
1.6.0 affected —
1.9.0 affected —
1.11.0 affected —
1.7.0 affected —
1.13.0 affected —
1.8.4 affected —
1.13.1 affected —
1.9.1 affected —
1.12.5 affected —
1.13.2 affected —
2.0.2 affected —
1.1.0 affected —
2.0.0 affected —
2.0.1 affected —
8.1.7.21512 affected —
8.1.7 affected —
8.1.5 affected —
8.1.3.21242 affected —
8.1.3 affected —
8.1.5.21322 affected —
8.1.7.21417 affected —
2.1.0.14 affected —
2.2.0 affected —
2.3.0 affected —
2.4.0 affected —
2.5.0 affected —
2.6.0 affected —
2.7.0 affected —
2.8.0 affected —
2.9.0 affected —
2.10.0 affected —
2.10.1 affected —
2.11.0 affected —
1.14.1 affected —
1.15.1 affected —
1.15.2 affected —
1.15.3 affected —
1.15.4 affected —
1.15.5 affected —
1.15.6 affected —
1.16.0 affected —
1.16.1 affected —
1.16.2 affected —
1.16.3 affected —
1.18.0 affected —
1.18.1 affected —
1.20.0 affected —
1.21.0 affected —
1.21.1 affected —
1.21.2 affected —
1.21.3 affected —
1.22.0 affected —
1.22.1 affected —
1.22.2 affected —
1.22.3 affected —
1.22.4 affected —
1.24.0 affected —
1.24.1 affected —
1.24.2 affected —
1.24.3 affected —
1.24.4 affected —
1.26.0 affected —
1.24.5 affected —
1.26.1 affected —
1.27.0 affected —
1.15.0 affected —
1.17.0 affected —
1.17.1 affected —
1.17.2 affected —
1.19.0 affected —
1.20.1 affected —
1.20.2 affected —
1.20.3 affected —
1.20.4 affected —
1.20.5 affected —
1.20.6 affected —
1.23.0 affected —
1.23.1 affected —
1.20.7 affected —
1.20.8 affected —
1.25.0 affected —
1.25.1 affected —
1.25.2 affected —
1.27.1 affected —
1.27.2 affected —
7.3.13 affected —
7.3.15 affected —
7.4.1 affected —
7.4.1.20425 affected —
7.4.1.20439 affected —
7.4.3 affected —
7.4.3.20679 affected —
7.4.5 affected —
7.5.1.20813 affected —
7.5.1.20833 affected —
7.5.3 affected —
7.5.5 affected —
8.0.1.21160 affected —
8.0.1.21164 affected —
7.5.7 affected —
7.5.9 affected —
7.5.11 affected —
8.1.7.21585 affected —
7.5.13.21586 affected —
7.5.13.21598 affected —
8.2.1.21612 affected —
8.2.1.21650 affected —
7.5.15.21611 affected —
7.5.17.21680 affected —
8.2.3.30119 affected —
8.2.4.30130 affected —
8.4.0 affected —
7.5.19 affected —
8.4.1.30298 affected —
8.4.2.30317 affected —
8.4.1.30307 affected —
7.5.20 affected —
8.4.3 affected —
8.4.4.30419 affected —
8.4.4.30467 affected —
7.5.21.21732 affected —
8.4.5.30483 affected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ cve-icon cve-icon
History

Wed, 04 Mar 2026 17:30:00 +0000

Type Values Removed Values Added
Description 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.
Title ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
Weaknesses CWE-248
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-04T17:44:55.869Z

Reserved: 2025-10-08T11:59:15.353Z

Link: CVE-2026-20031

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-04T18:16:16.773

Modified: 2026-03-04T18:16:16.773

Link: CVE-2026-20031

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses