CVE-2025-20234
ClamAV UDF Denial of Service
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 .
INFO
Published Date :
June 18, 2025, 5:15 p.m.
Last Modified :
Aug. 11, 2025, 6:24 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-20234
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Upgrade ClamAV to version 1.0.9, 1.4.3, or later.
- Upgrade Cisco Secure Endpoint to the fixed version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-20234.
| URL | Resource |
|---|---|
| https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html | Vendor Advisory |
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-20234 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-20234
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-20234 vulnerability anywhere in the article.
-
Cyber Security News
ClamAV 1.4.3 and 1.0.9 Released With Fix for Vulnerabilities that Enable Remote Code Execution
Multiple high-severity vulnerabilities, including a dangerous buffer overflow capable of remote code execution, have been fixed in critical security updates released by the ClamAV team for versions 1. ... Read more
The following table lists the changes that have been made to the
CVE-2025-20234 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 11, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:* versions from (including) 1.2.0 up to (excluding) 1.4.3 Added CPE Configuration OR *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:* versions up to (excluding) 1.26.1 *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:* versions up to (excluding) 1.26.1 *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:* versions up to (excluding) 7.5.21 *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:* versions from (including) 8.0.1.21160 up to (excluding) 8.4.5 *cpe:2.3:a:cisco:secure_endpoint_private_cloud:*:*:*:*:*:*:*:* versions up to (excluding) 4.2.2 Added Reference Type Cisco Systems, Inc.: https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html Types: Vendor Advisory Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy Types: Third Party Advisory -
New CVE Received by [email protected]
Jun. 18, 2025
Action Type Old Value New Value Added 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 . Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-125 Added Reference https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy