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ClamAV CVE-2026-20213

| EUVDEUVD-2026-41080 HIGH
Classic Buffer Overflow (CWE-120)
2026-07-01 psirt@cisco.com GHSA-rjvx-x4g3-vr6w
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

Any untrusted file reaching the scanner is network-reachable with no auth or interaction (AV:N/AC:L/PR:N/UI:N); confirmed impact is process 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 - 17:38 vuln.today

DescriptionCVE.org

A vulnerability in the PE 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 PE 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 PE content 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 PE (Portable Executable) file format parser lets an unauthenticated, remote attacker crash the scanning engine by submitting a crafted PE file for scanning, triggering an out-of-bounds buffer write (CWE-120). Reported by Cisco PSIRT (ClamAV's maintainer), the flaw carries CVSS 7.5 with an availability-only impact; the advisory notes memory corruption could 'possibly' enable expanded impacts beyond DoS. No public exploit identified at time of analysis, and the vulnerability is not listed in CISA KEV.

Technical ContextAI

ClamAV is a widely used open-source antivirus engine (maintained by Cisco/Talos) commonly embedded in mail gateways, file-upload scanners, proxies, and endpoint agents. The defect lives in the engine's PE file parser, the component that dissects Windows executable structure (DOS/PE headers, section tables, data directories) to inspect and unpack executables during a scan. Per the description, improper boundary checks on content within PE files produce an out-of-bounds buffer write, the classic CWE-120 buffer copy without size validation. Because ClamAV scans attacker-supplied content by design, the parser is directly reachable by any file that reaches the scanning path.

RemediationAI

Upgrade ClamAV to a fixed release as directed by the Cisco/ClamAV advisory (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR); the exact patched version was not included in the provided data, so confirm the target version directly from that advisory before deploying. If immediate patching is not possible, the most targeted compensating control is to reduce exposure of the PE parser: where the environment does not need to scan Windows executables, disabling or filtering PE scanning (or blocking/quarantining executable content upstream before it reaches ClamAV) limits reachability, at the trade-off of reduced malware coverage for executables. Additionally, run clamd under a supervisor/watchdog (e.g., systemd restart, monitored service) and rate-limit untrusted scan sources so that a crash-loop degrades gracefully rather than causing a sustained outage; note this mitigates availability impact but does not fix the underlying memory corruption.

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Same weakness CWE-120 – Classic Buffer Overflow

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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-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

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-2026-20213 vulnerability details – vuln.today
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