CVE-2013-3461: Cisco Unified Communications Manager

High severity, CVSS 7.1. EPSS: 1.3% chance of exploitation in the next 30 days.

Cisco Unified Communications Manager (Unified CM) 8.5(x) and 8.6(x) before 8.6(2a)su3 and 9.x before 9.1(1) does not properly restrict the rate of SIP packets, which allows remote attackers to cause a denial of service (memory and CPU consumption, and service disruption) via a flood of UDP packets to port 5060, aka Bug ID CSCub35869.

Affected products

• Cisco Unified Communications Manager: version 9.0(1) only; version 8.5 only; version 8.5(1) only; version 8.5(1)su1 only; version 8.5(1)su2 only; version 8.5(1)su3 only; …

Published 2013-08-25. Last modified 2026-06-16.