Unspecified vulnerability in Cisco Unified Communications Manager (aka CUCM formerly CallManager) 6.x before 6.1(5)su2 7.x before 7.1(5b)su3 8.x before 8.0(3a)su1 and 8.5 before 8.5(1) allows remote attackers to cause a denial of service (service outage) via a SIP INVITE message aka Bug ID CSCth43256.