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Fencer Vulns
critical 9.8

CVE-2025-20260 json

ClamAV PDF Scanning Buffer Overflow Vulnerability

published 2025-06-18 16 mo ago modified 2026-11-03 5 d ago also EUVD-2025-18658

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

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.

Patch / fix

  • cisco clam_antivirus 1.0.9-0, 1.4.3-0
  • cisco clamav 1.0.9-0, 1.4.3-0
  • clamav clamav 1.0.9-0, 1.4.3-0
  • clamavs clamav 1.0.9-0, 1.4.3-0
  • clam_anti-virus clamav 1.0.9-0, 1.4.3-0
  • clamav Debian 12 1.0.9+dfsg-1~deb12u1
  • clamav Debian 14, Debian 13 1.4.3+dfsg-1

debian advisories DEBIAN-CVE-2025-20260

  • clamav Ubuntu 22.04 LTS 1.4.3+dfsg-0ubuntu0.22.04.1
  • clamav Ubuntu 24.04 LTS 1.4.3+dfsg-0ubuntu0.24.04.1
  • clamav Ubuntu 25.10 1.4.3+dfsg-0ubuntu1
  • clamav Ubuntu Pro 20.04 LTS 1.4.3+dfsg-0ubuntu0.20.04.1+esm1

ubuntu advisories UBUNTU-CVE-2025-20260

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 1.4.3-150600.18.18.1
  • clamav SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +12 more 1.4.3-150200.8.14.1
  • clamav SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.4.3-3.47.1

suse advisories SUSE-SU-2025:02201-1SUSE-SU-2025:02200-1SUSE-SU-2025:02119-1

  • clamav openSUSE Tumbleweed 1.4.3-1.1

opensuse advisories openSUSE-SU-2025:15211-1

  • clamav Alpine 3.24, Alpine 3.23, Alpine 3.22 1.4.3-r0

alpine advisories ALPINE-CVE-2025-20260

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav CBL-Mariner 2.0, Azure Linux 3.0 1.0.9-1

azure linux advisories AZL-64208AZL-64223

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • clamav Arch Linux 1.4.3-1

arch linux advisories AVG-2903

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-20260 updated cvss 9.8

clamav: ClamAV PDF Scanning Buffer Overflow Vulnerability

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa vex VA-25-171-01 updated cvss 9.8

ClamAV

  • Cisco ClamAV <1.4.3, <1.0.9
    affected: fixed in 1.4.3 blog.clamav.net
  • Cisco ClamAV 1.4.3, 1.0.9
    fixed

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
16 mo ago

Exploit prediction

1.64% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Cisco ClamAV

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.