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ClamAV CVE-2026-20215

| EUVDEUVD-2026-41083 HIGH
Classic Buffer Overflow (CWE-120)
2026-07-01 psirt@cisco.com GHSA-6gff-7f37-2v35
Buffer Overflow Cisco Red Hat Secure Endpoint 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 is scanned via network-facing pipelines (AV:N) with no auth or interaction (PR:N/UI:N); confirmed impact is scanner crash only (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 7z 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 7z 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 7z 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 7z archive scanner allows a remote, unauthenticated attacker to crash the scanning process by submitting a crafted 7z file, resulting in an out-of-bounds heap write (CWE-120). Because ClamAV is commonly deployed inline on mail gateways and upload-scanning pipelines, a single malicious attachment can be delivered without any interaction or credentials. No public exploit identified at time of analysis and the flaw is not listed in CISA KEV, though Cisco (ClamAV's maintainer) rates confidentiality/integrity impact as none and availability as high.

Technical ContextAI

ClamAV is Cisco's open-source anti-malware engine that unpacks and inspects a wide range of archive and container formats before applying signatures. The defect lives in the engine's native 7z (7-Zip / LZMA) format parser, which walks the compressed stream's headers and content structures during scanning. CWE-120 (classic buffer copy without bounds check) indicates the parser copies attacker-controlled content into a fixed-size buffer without validating length against the destination, producing an out-of-bounds write. Memory-corruption primitives of this class can, beyond crashing, in principle be leveraged for control-flow effects, which is why the advisory hedges with 'possibly other expanded impacts,' but only DoS is described concretely.

RemediationAI

Upgrade to the fixed ClamAV release identified in the Cisco advisory (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR); an exact fixed version was not provided in this dataset, so confirm the specific patched build against that advisory before deploying. As a compensating control until patched, disable 7z scanning by setting ScanArchive no (or the format-specific equivalent) in clamd.conf, or strip/block 7z attachments and uploads at the mail or web tier - the trade-off is reduced malware coverage for 7z-packed threats, so pair it with archive-type blocking at the perimeter. Additionally, run clamd under a restricted, auto-restarting service (systemd Restart=on-failure) and process isolation so a crash degrades rather than disables scanning, and rate-limit or sandbox untrusted file submissions to blunt repeated crash attempts.

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Same weakness CWE-120 – Classic Buffer Overflow

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CVE-2017-7269 CRITICAL POC
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CVE-2019-11043 CRITICAL POC
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CVE-2016-10174 CRITICAL POC
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CVE-2016-0099 HIGH POC
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CVE-2016-6366 HIGH POC
8.8
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
9.8
CVE-2015-3113 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
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-2026-20215 vulnerability details – vuln.today
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