CVE-2026-20031

mediumpriority · track · 0EPSS 0.004 · 38 %ileDEEUNLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.44% (38th) EPSS
CVSS 5.3 · medium
Is it mine?
334 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cert_bund · cisco_csaf

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

5.3
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4
v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · SUSE Product Security
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · NCSC-NL NL
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-248USCWE-248US
05

affected products (334)

Products and version ranges known to be affected.

showing 20 of 334
06

advisories (4)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0077Kwetsbaarheden verholpen in Cisco Secure Firewall systemenNL2026-03-05csaf · ncsc_nlNL

    Cisco heeft meerdere kwetsbaarheden verholpen in Cisco Secure Firewall (inclusief ASA en FTD software).

  • WID-SEC-W-2026-0593ClamAV: Schwachstelle ermöglicht Denial of ServiceDeutsch2026-03-04csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in ClamAV ausnutzen, um einen Denial of Service Angriff durchzuführen.

  • cisco-sa-clamav-css-Fn4QSZClamAV Cascading Style Sheets Image Parsing Error Handling Denial of Service Vulnerability2026-03-04csaf · cisco_csafUS

    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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  • openSUSE-SU-2026:10325-1clamav-1.5.2-1.1 on GA media2026-03-13csaf · suse_csafDE

    clamav-1.5.2-1.1 on GA media

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundcisco_csafncsc_nlsuse_csafNVDCVE.orgMITRE
published 2026-03-04modified 2026-06-17
09

references (4)

External citations — patches, advisories, analysis.

scry

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