The EnergyWise module in Cisco IOS 12.2 15.0 15.1 15.2 and 15.4 and IOS XE 3.2.xXO 3.3.xSG 3.4.xSG and 3.5.xE before 3.5.3E allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 packet aka Bug ID CSCup52101.