CVE-2006-5553: Cisco Security Agent

High severity, CVSS 7.8. EPSS: 3.2% chance of exploitation in the next 30 days.

Cisco Security Agent (CSA) for Linux 4.5 before 4.5.1.657 and 5.0 before 5.0.0.193, as used by Unified CallManager (CUCM) and Unified Presence Server (CUPS), allows remote attackers to cause a denial of service (resource consumption) via a port scan with certain options.

Affected products

• Cisco Security Agent: version 4.5 only; version 4.5.1 only; version 4.5.1.639 only; version 5.0 only
• Cisco Unified Callmanager: version 5.0(1) only; version 5.0(2) only; version 5.0(3) only; version 5.0(3a) only; version 5.0(4) only
• Cisco Unified Presence Server: version 1.0 only; version 1.0(2) only

Published 2006-10-26. Last modified 2026-06-16.