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ClamAV CVE-2026-20217

| EUVDEUVD-2026-41082 HIGH
Classic Buffer Overflow (CWE-120)
2026-07-01 psirt@cisco.com GHSA-34f3-w8ff-r2xx
Buffer Overflow Secure Endpoint Clamav 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

Untrusted files reach the scanner remotely without auth (AV:N/PR:N/UI:N/AC:L); confirmed impact is a scan-process crash only, so A:H with C:N/I:N.

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 - 17:39 vuln.today

DescriptionCVE.org

A vulnerability in the PESpin 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 PESpin 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 PESpin 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

Availability-impacting out-of-bounds write in ClamAV's PESpin file-format parser lets an unauthenticated remote attacker crash the scanning engine by submitting a crafted PESpin-packed file for scanning. Because ClamAV frequently sits inline on mail gateways, file-upload paths, and proxies, a single malicious sample can terminate the scanning process and produce a denial of service; the memory corruption may permit expanded impact beyond DoS though only crash impact is confirmed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious PESpin-packed file
Delivery
Submit file to ClamAV-scanned intake
Exploit
Trigger out-of-bounds write in PESpin unpacker
Execution
Corrupt memory and crash clamd
Impact
Denial of service on scanning host
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target runs ClamAV with PE/packer unpacking active (ScanPE enabled, the default) so the PESpin unpacker executes, and that the attacker can get a crafted PESpin-containing file scanned - e.g., via an inbound mail gateway, file-upload endpoint, or proxy that automatically hands files 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, base 7.5) reflects a network-reachable, low-complexity, unauthenticated attack with high availability impact and no confidentiality/integrity impact - i.e., a reliable DoS rather than confirmed code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker emails or uploads a specially crafted file containing malformed PESpin-packed content to a service that automatically scans inbound files with ClamAV. When clamd parses the PESpin structure, the out-of-bounds write corrupts memory and terminates the scanning process, disabling malware scanning for the affected node. …
Remediation Patch available per vendor advisory - upgrade ClamAV to the fixed release listed in Cisco advisory cisco-sa-clamav-88cFYyxR (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR); the exact patched version is not confirmed from the provided data and must be taken from the advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all ClamAV deployments and enable alerting on service crashes; review logs for suspicious submissions. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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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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CVE-2026-20217 vulnerability details – vuln.today
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