CVE-2013-1133: Cisco Unified Communications Manager

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

Cisco Unified Communications Manager (CUCM) 8.6 before 8.6(2a)su2, 8.6 BE3k before 8.6(4) BE3k, and 9.x before 9.0(1) allows remote attackers to cause a denial of service (CPU consumption and GUI and voice outages) via malformed packets to unused UDP ports, aka Bug ID CSCtx43337.

Affected products

• Cisco Unified Communications Manager: version 8.6 only; version 8.6(1) only; version 8.6(1a) only; version 8.6(2) only; version 8.6(2a) only; version 8.6(2a)su1 only; …

Published 2013-02-27. Last modified 2026-06-16.