Cisco NX-OS 4.1 through 7.3 and 11.0 through 11.2 on Nexus 2000 3000 3500 5000 5500 5600 6000 7000 7700 and 9000 devices allows remote attackers to cause a denial of service (device crash) via malformed IPv4 DHCP packets to the DHCPv4 relay agent aka Bug IDs CSCuq39250 CSCus21733 CSCus21739 CSCut76171 and CSCux67182.