CVE-2026-20348: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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.
AI Analysis
Technical Summary
This vulnerability involves a classic buffer overflow in the XAR file format parser of ClamAV integrated into Cisco Secure Endpoint. The flaw is due to insufficient boundary checks on input sizes when scanning XAR files, potentially causing memory corruption. Exploitation requires an attacker to submit a specially crafted file containing XAR content to the scanning engine. Successful exploitation results in termination of the scanning process, causing a denial-of-service condition. The vulnerability affects multiple specific versions of Cisco Secure Endpoint as enumerated. There is no vendor advisory or patch information provided to confirm remediation status.
Potential Impact
The primary impact is a denial-of-service condition on the affected software, caused by termination of the ClamAV scanning process due to memory corruption. There is no confirmed impact on confidentiality or integrity. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is available, organizations should consider restricting exposure of the scanning service to untrusted inputs and monitor for abnormal termination of the scanning process.
CVE-2026-20348: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
Description
A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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.
CVSS v3.1
Score 7.5high
Affected software
Cisco
Cisco Secure Endpoint
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a classic buffer overflow in the XAR file format parser of ClamAV integrated into Cisco Secure Endpoint. The flaw is due to insufficient boundary checks on input sizes when scanning XAR files, potentially causing memory corruption. Exploitation requires an attacker to submit a specially crafted file containing XAR content to the scanning engine. Successful exploitation results in termination of the scanning process, causing a denial-of-service condition. The vulnerability affects multiple specific versions of Cisco Secure Endpoint as enumerated. There is no vendor advisory or patch information provided to confirm remediation status.
Potential Impact
The primary impact is a denial-of-service condition on the affected software, caused by termination of the ClamAV scanning process due to memory corruption. There is no confirmed impact on confidentiality or integrity. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is available, organizations should consider restricting exposure of the scanning service to untrusted inputs and monitor for abnormal termination of the scanning process.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.413Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a760e52bf8831d539a765e8
Added to database: 08/07/2026, 16:56:50 UTC
Last enriched: 08/07/2026, 17:11:42 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 67
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