CVE-2024-20380 | ClamAV HTML Parser Denial of Service Vulnerability

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.

Published: 2024-04-18 Last update: 2025-07-23 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20380 is rated Moderate Risk (51.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.50%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-20380

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 1.50% 0.50% -1.00%
2 2025-11-18 0.50% 1.50% +1.00%
3 2025-07-24 — 0.50% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20380

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-20380

OS Trackers for CVE-2024-20380

vendor priority summary link
debian unimportant CVE-2024-20380 unimportant priority: Debian including 1 source packages (clamav), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-20380
suse high CVE-2024-20380 severity important: SUSE including 48 source package names (clamav, clamav-1.3.1-1.1, …), 230 product×package rows across 46 product lines (Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production, … (46 product lines)): Fixed 197, Known Not Affected 33. https://www.suse.com/security/cve/CVE-2024-20380/
ubuntu medium CVE-2024-20380 medium priority: Ubuntu including 1 source packages (clamav), 8 status rows across 8 suites (bionic, focal, jammy, mantic, noble, trusty, upstream, xenial): not-affected 7, needs-triage 1. https://ubuntu.com/security/CVE-2024-20380

Affected software / configurations for CVE-2024-20380

Vendor Product Version Raw CPE
clamav clamav 1.3.0 cpe:2.3:a:clamav:clamav:1.3.0:-:*:*:*:*:*:*
clamav clamav 1.3.0 cpe:2.3:a:clamav:clamav:1.3.0:rc:*:*:*:*:*:*
clamav clamav 1.3.0 cpe:2.3:a:clamav:clamav:1.3.0:rc2:*:*:*:*:*:*

References for CVE-2024-20380

cvelogic Threat Intelligence