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ClamAV CVE-2026-20214

| EUVDEUVD-2026-41079 HIGH
Classic Buffer Overflow (CWE-120)
2026-07-01 psirt@cisco.com GHSA-86w7-h9x4-hpxv
Buffer Overflow Secure Endpoint Red Hat Suse
7.5
CVSS 3.1 · Vendor: cisco
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Severity by source

Vendor (cisco) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

File reaches the scanner over the network with no auth or interaction (AV:N/AC:L/PR:N/UI:N); confirmed impact is scanner crash only, so C:N/I:N/A:H.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (cisco).

CVSS VectorVendor: cisco

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

1
Analysis Generated
Jul 01, 2026 - 17:37 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Denial of service in ClamAV's FSG file format parser allows an unauthenticated remote attacker to crash the scanning engine, and potentially achieve broader memory-corruption impact, by submitting a crafted FSG-compressed portable executable to be scanned. The flaw stems from an out-of-bounds buffer write during FSG decompression, affecting any deployment that scans attacker-supplied files. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, though the network-reachable, no-authentication, no-interaction nature (CVSS 7.5) makes it a meaningful availability risk for mail/file-scanning gateways.

Technical ContextAI

ClamAV is a widely used open-source antivirus engine that unpacks and inspects many executable and archive formats to detect malware, including files compressed with FSG (a compressor/packer historically used to shrink Windows PE executables). To scan a packed PE, ClamAV must decompress the FSG container in memory before signature matching. The vulnerability is a classic CWE-120 (Buffer Copy without Checking Size of Input, 'Classic Buffer Overflow'): the FSG parser performs improper boundary checks on the embedded content, so specially sized/crafted FSG data drives an out-of-bounds write beyond an allocated buffer. Because scanning is fully automated and triggered simply by presenting a file, the vulnerable code path is reached without any user action. The vulnerability was reported by Cisco PSIRT, consistent with Cisco's stewardship of ClamAV.

RemediationAI

Upgrade ClamAV to the fixed release identified in the Cisco Security Advisory (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR); the exact patched version is not included in the provided input and must be read from that advisory rather than invented. As a compensating control until patched, you can disable scanning of the affected packer path - set 'ScanPE no' in clamd.conf to turn off portable-executable unpacking (side effect: reduced detection of packed PE malware, a real security trade-off), and consider limiting or rejecting inbound file types that reach the scanner. Where ClamAV is embedded in a third-party appliance, apply the vendor's downstream update. After patching, restart clamd and any daemons that link libclamav so the fixed parser is loaded.

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Same weakness CWE-120 – Classic Buffer Overflow

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CVE-2016-0099 HIGH POC
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CVE-2016-6366 HIGH POC
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CVE-2013-1331 HIGH
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CVE-2013-0641 HIGH
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CVE-2017-15222 CRITICAL POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
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CVE-2009-0927 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected

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CVE-2026-20214 vulnerability details – vuln.today
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