The SIP inspection engine in Cisco Adaptive Security Appliance (ASA) Software 8.2 before 8.2(5.48) 8.4 before 8.4(6.5) 9.0 before 9.0(3.1) and 9.1 before 9.1(2.5) allows remote attackers to cause a denial of service (memory consumption or device reload) via crafted SIP packets aka Bug ID CSCuh44052.