CVE-2025-20260
ClamAV PDF Buffer Overflow Vulnerability
Description
A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process.
INFO
Published Date :
June 18, 2025, 6:15 p.m.
Last Modified :
Aug. 11, 2025, 6:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update ClamAV to version 1.0.9, 1.4.3, or later.
- Update the affected packages.
Public PoC/Exploit Available at Github
CVE-2025-20260 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2025-20260.
| URL | Resource |
|---|---|
| https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html | Vendor 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-2025-20260 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-2025-20260
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).
A practical exercise in proactive security: identifying, analyzing, and reporting on vulnerabilities to harden system security posture.
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-20260 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-2025-20260 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 CPE Configuration OR *cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.9 *cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:* versions from (including) 1.2.0 up to (excluding) 1.4.3 Added Reference Type Cisco Systems, Inc.: https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html Types: Vendor Advisory -
New CVE Received by [email protected]
Jun. 18, 2025
Action Type Old Value New Value Added Description A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-122 Added Reference https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html