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Fencer Vulns
high 7.5

CVE-2024-20380 json

ClamAV HTML Parser Denial of Service Vulnerability

published 2024-04-18 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-18095

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

A vulnerability in the HTML parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an issue in the C to Rust foreign function interface. An attacker could exploit this vulnerability by submitting a crafted file containing HTML content to be scanned by ClamAV on an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Patch / fix

  • cisco clam_antivirus 1.3.1-0
  • cisco clamav 1.3.1-0
  • clamav clamav 1.3.1-0
  • clamavs clamav 1.3.1-0
  • clam_anti-virus clamav 1.3.1-0
  • clamav SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 1.4.2-150600.18.6.1
  • clamav SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +12 more 1.4.2-150200.8.3.1
  • clamav SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.4.2-3.36.1

suse advisories SUSE-SU-2025:0328-1SUSE-SU-2025:0327-1SUSE-SU-2025:0325-1

  • clamav openSUSE Tumbleweed 1.3.1-1.1

opensuse advisories openSUSE-SU-2024:14087-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-20380 updated cvss 7.5

clamav: denial of service via HTML parser

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.10% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Cisco ClamAV
  • cisco clam_antivirus

Classification

Weakness
  • CWE-475 Undefined Behavior for Input to API

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.