CVE-2011-2072: Cisco IOS

High severity, CVSS 7.8. EPSS: 1.7% chance of exploitation in the next 30 days.

Memory leak in Cisco IOS 12.4, 15.0, and 15.1, Cisco IOS XE 2.5.x through 3.2.x, and Cisco Unified Communications Manager (CUCM) 6.x and 7.x before 7.1(5b)su4, 8.x before 8.5(1)su2, and 8.6 before 8.6(1) allows remote attackers to cause a denial of service (memory consumption and device reload or process failure) via a malformed SIP message, aka Bug IDs CSCtl86047 and CSCto88686.

Affected products

• Cisco IOS: version 12.4 only; version 15.0 only; version 15.1 only
• Cisco IOS XE: version 2.5.0 only; version 2.5.1 only; version 2.5.2 only; version 2.6.0 only; version 2.6.1 only; version 2.6.2 only; …
• 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 2011-10-03. Last modified 2026-06-16.