CVE-2026-20348: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
CVE-2026-20348 is a high-severity vulnerability in the XAR file format parser used by ClamAV within Cisco Secure Endpoint. It arises from improper boundary checks during scanning of XAR files, which can lead to memory corruption. An unauthenticated remote attacker can exploit this by submitting a crafted XAR file to cause a denial-of-service (DoS) condition by terminating the ClamAV scanning process. No information about active exploitation or patches is currently available.
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
CVE-2026-20348 is a high-severity vulnerability in the XAR file format parser used by ClamAV within Cisco Secure Endpoint. It arises from improper boundary checks during scanning of XAR files, which can lead to memory corruption. An unauthenticated remote attacker can exploit this by submitting a crafted XAR file to cause a denial-of-service (DoS) condition by terminating the ClamAV scanning process. No information about active exploitation or patches is currently available.
CVSS v3.1
Score 7.5high
Affected software
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
- Remediation Level
- null
Threat ID: 6a760e52bf8831d539a765e8
Added to database: 08/07/2026, 16:56:50 UTC
Last enriched: 08/07/2026, 17:11:42 UTC
Last updated: 08/07/2026, 17:11:42 UTC
Views: 4
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