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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 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 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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed 7z file
Delivery
Deliver via email/upload to scanner
Exploit
ClamAV 7z parser reads content
Execution
Out-of-bounds buffer write triggered
Impact
Scanning process terminates (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires only that ClamAV be configured to scan archive/7z content (the default when archive scanning is enabled) and that the attacker can get a file in front of the scanner - e.g., as a mail attachment, web upload, or file drop routed to clamd. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 7.5) is internally consistent with a real-world scanning workflow: files reach ClamAV over the network via mail or upload pipelines, so no local access, credentials, or user interaction on the target host is needed, and the only impact is availability (process termination). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker emails a specially crafted 7z attachment to an organization whose mail gateway invokes ClamAV to scan inbound messages. When the engine parses the malformed 7z content, the out-of-bounds write terminates the scanning process, stalling or bypassing scanning for the mail queue; repeated messages sustain the outage. …
Remediation 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. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: disable 7z archive scanning in ClamAV or implement strict file-type filtering to reject 7z files at ingress points. …

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Same weakness CWE-120 – Classic Buffer Overflow

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Same technique Buffer Overflow

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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-2026-20215 vulnerability details – vuln.today
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