Cisco Unified Communications Manager (aka CUCM formerly CallManager) 5.x before 5.1(3g) 6.x before 6.1(4) 7.0.x before 7.0(2a)su1 and 7.1.x before 7.1(2) allows remote attackers to cause a denial of service (service restart) via malformed SIP messages aka Bug ID CSCsz95423.