Unspecified vulnerability in Cisco Unified Communications Manager (aka CUCM formerly CallManager) 6.x before 6.1(5)su2 7.x before 7.1(5)su1 8.0 before 8.0(3) and 8.5 before 8.5(1) allows remote attackers to cause a denial of service (process failure) via a malformed SIP message aka Bug ID CSCtg62855.