A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device.

This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00463.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

No data.

Configuration 1 [-]

OR cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*

Configuration 2 [-]

OR cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*
cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Cisco Subscribe
Secure Endpoint Subscribe
Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8517-1 ClamAV vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-20214 cve-icon
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-20214 cve-icon
History

Wed, 29 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco secure Endpoint
Vendors & Products Cisco
Cisco secure Endpoint

Sat, 04 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

 threat_severity

Important

Wed, 01 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 01 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Description A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
Title ClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-07-01T17:25:09.148Z

Reserved: 2025-10-08T11:59:15.398Z

Link: CVE-2026-20214

cve-icon Vulnrichment

Updated: 2026-07-01T17:21:06.682Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-01T17:16:29.637

Modified: 2026-07-09T17:57:33.330

Link: CVE-2026-20214

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-01T16:27:33Z

Links: CVE-2026-20214 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T23:00:05Z

Weaknesses