The SendCombinedStatusInfo implementation in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 7.0SU before 7.0(2a)SU3, 7.1 before 7.1(5), and 8.0 before 8.0(3) allows remote attackers to cause a denial of service (process failure) via a malformed SIP REGISTER message, aka Bug ID CSCtf66305.