Cisco IOS 15.0 15.1 15.2 and 15.4 and IOS XE 3.3.xSE before 3.3.2SE 3.3.xXO before 3.3.1XO 3.5.xE before 3.5.2E and 3.11.xS before 3.11.1S allow remote attackers to cause a denial of service (device reload) via malformed mDNS packets aka Bug ID CSCul90866.