CVE-2011-4019
Memory leak in Cisco IOS 12.4 and 15.0 through 15.2, and Cisco Unified Communications Manager (CUCM) 7.x, allows remote attackers to cause a denial of service (memory consumption) via a crafted response to a SIP SUBSCRIBE message, aka Bug IDs CSCto93837 and CSCtj61883.
Date published : 2012-05-03
http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151TCAVS.html
http://www.cisco.com/web/software/282074295/90289/cucm-readme-715bsu5.pdf