Cisco IOS 12.4 and 15.0 through 15.4 and IOS XE 3.1.xS 3.2.xS 3.3.xS 3.4.xS 3.5.xS 3.6.xS and 3.7.xS before 3.7.6S; 3.8.xS 3.9.xS and 3.10.xS before 3.10.1S; and 3.11.xS before 3.12S allow remote attackers to cause a denial of service (device reload) via a crafted SIP message aka Bug ID CSCul46586.