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ClamAV EUVDEUVD-2026-41079

| CVE-2026-20214 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

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 - 17:37 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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft FSG-packed PE file
Delivery
Submit file to scanning service
Exploit
Trigger out-of-bounds write in FSG parser
Execution
Corrupt scanner process memory
Impact
Crash ClamAV scanning engine (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires that ClamAV actually scan an attacker-supplied file and that its FSG/PE unpacking path be exercised - i.e., the target must ingest untrusted files (mail attachment scanning, file-upload scanning, proxy/ICAP inspection) and have PE unpacking enabled (ScanPE, on by default). … 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, score 7.5) indicates a network-reachable, low-complexity, unauthenticated, no-interaction flaw whose confirmed impact is availability-only - a scanner crash/DoS. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker emails or uploads a small crafted PE that is compressed with FSG so that its embedded content violates the parser's boundary assumptions; when the mail gateway or upload handler passes the file to ClamAV, the FSG unpacker writes out of bounds and the scanning process terminates. Repeating this creates a sustained denial of service for the scanning tier, and because the primitive is a memory write, more severe impact cannot be fully excluded. …
Remediation 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. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all ClamAV installations and document which systems are internet-facing or accept untrusted file input. …

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Same weakness CWE-120 – Classic 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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EUVD-2026-41079 vulnerability details – vuln.today
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