CVE-2011-1604: Cisco Unified Communications Manager

High severity, CVSS 7.1. EPSS: 2.5% chance of exploitation in the next 30 days.

Memory leak in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.x before 6.1(5)su3, 7.x before 7.1(5b)su3, 8.0 before 8.0(3a)su2, and 8.5 before 8.5(1) allows remote attackers to cause a denial of service (memory consumption and process failure) via a malformed SIP message, aka Bug ID CSCti42904.

Affected products

• Cisco Unified Communications Manager: version 6.0 only; version 6.1(1) only; version 6.1(1a) only; version 6.1(1b) only; version 6.1(2) only; version 6.1(2)su1 only; …

Published 2011-05-03. Last modified 2026-06-16.