CISCO Security Advisory
Published Date: Not specified
CVE: CVE-2026-20337
Advisory Summary
◼️▌🛡️ ClamAV Vulnerabilities Affecting Cisco Products (August 2026)
Cisco has published an advisory warning that multiple ClamAV vulnerabilities could enable a remote attacker to trigger a Denial of Service (DoS), potentially interrupting scanning operations on affected Cisco endpoints/connectors. Cisco indicates no workarounds are available and software updates will be released for impacted platforms.
- High (Windows platforms only): ClamAV runs the scanning process in a privileged security context, with Cisco Secure Endpoint Connector for Windows called out as highly impacted.
- Medium (Linux/Mac platforms): ClamAV runs in a lower-privileged context, impacting Secure Endpoint Connector for Linux and Mac.
- Not impacted: Cisco Secure Endpoint Private Cloud itself is not affected, but the Connector software distributed from it is impacted.
- CVE-2026-20337
- CVE-2026-20338
- CVE-2026-20339
- CVE-2026-20345
- CVE-2026-20346
- CVE-2026-20347
- CVE-2026-20348
🔍 Market/operations risk to watch
⛔ If scanning becomes unreliable or stops, organizations may experience reduced malware detection coverage, higher operational noise (failed scans), and potential incident response delays—especially where endpoint connectors are the primary inspection point.
🛠️ Actionable recommendations (do now / plan next)
1. Inventory exposure: Identify installations of Cisco Secure Endpoint Connector on Windows, Linux, and Mac (including versions delivered/managed via Secure Endpoint Private Cloud).
2. Prioritize Windows connector patches: Given the High rating in privileged context, treat Windows remediation as highest urgency.
3. Implement temporary risk controls while awaiting updates: Since Cisco reports no workarounds, focus on compensating controls—e.g., tighten inbound access to systems running scanning components and monitor for signs of scanning interruption/DoS behavior.
4. Validate after patching: Confirm ClamAV scanning resumes normal operation and that connector health checks remain green.
-2026
Reference: Vendor Advisory