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Vulnerability record · CVE-2025-20260 · published 18 June 2025

CVE-2025-20260: Clamav heap-based buffer overflow vulnerability

Clamav · Clamav

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.

9.8 CVSS 3.1 Critical EPSS 1.6% · top 24.5% CWE-122 · Heap-based buffer overflow
9.8CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/09/msg00006.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2010-0098Clamav vulnerabilityClamAV before 0.96 does not properly handle the (1) CAB and (2) 7z file formats, which allows remote attackers to bypass virus detection via a crafte…EPSS 4.9%10.0CVE-2009-1372Clamav memory buffer overflow vulnerabilityStack-based buffer overflow in the cli_url_canon function in libclamav/phishcheck.c in ClamAV before 0.95.1 allows remote attackers to cause a denial…EPSS 7.6%10.0CVE-2008-3914Clamav information exposure vulnerabilityMultiple unspecified vulnerabilities in ClamAV before 0.94 have unknown impact and attack vectors related to file descriptor leaks on the "error path…EPSS 3.6%10.0CVE-2008-0728Clamav vulnerabilityThe unmew11 function in libclamav/mew.c in libclamav in ClamAV before 0.92.1 has unknown impact and attack vectors that trigger "heap corruption."EPSS 2.8%10.0CVE-2006-1615Clamav vulnerabilityMultiple format string vulnerabilities in the logging code in Clam AntiVirus (ClamAV) before 0.88.1 might allow remote attackers to execute arbitrary…EPSS 12%9.8CVE-2023-20032Cisco secure endpoint classic buffer overflow vulnerabilityOn Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the HFS+ partition file parser of ClamA…EPSS 29%9.8CVE-2013-7087Clamav memory buffer overflow vulnerabilityClamAV before 0.97.7 has WWPack corrupt heap memoryEPSS 2.9%9.8CVE-2013-7088Clamav classic buffer overflow vulnerabilityClamAV before 0.97.7 has buffer overflow in the libclamav componentEPSS 3.1%

Source: NIST National Vulnerability Database (record CVE-2025-20260), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.