Is CVE-2025-20234 in the CISA KEV catalog?

No. CVE-2025-20234 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-20234?

CVE-2025-20234 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-20234?

CVE-2025-20234 has an EPSS score of 0.66% (47th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-20234?

Upgrade clamav on debian 13 to 1.4.3+dfsg-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-20234

MEDIUM

5.3

CVSS v3

NVD

Description

A vulnerability in Universal Disk Format (UDF) processing 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 a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process, resulting in a DoS condition on the affected software. For a description of this vulnerability, see the .

CWE-125Out-of-bounds Read

How to fix

Remediation Available

clamavDebian

Fixed in:1.4.3+dfsg-1CVE-2025-20234

clamavUbuntu

Fixed in:1.4.3+dfsg-0ubuntu0.20.04.1+esm1USN-7615-2

Fixed in:1.4.3+dfsg-0ubuntu0.22.04.1USN-7615-1

Fixed in:1.4.3+dfsg-0ubuntu0.24.04.1USN-7615-1

ClamAVWindows application

Affected:1.2.0 1.4.3Fixed in:1.4.3Cisco Systems, Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.66%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Vendor Advisory1

blog.clamav.net

Third-Party Advisory1

sec.cloudapps.cisco.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-11.