Cisco NX-OS 4.1 through 7.3 and 11.0 through 11.2 on Nexus 2000 5000 5500 5600 6000 7000 7700 and 9000 devices allows remote attackers to cause a denial of service (device crash) via crafted IPv4 DHCP packets to the (1) DHCPv4 relay agent or (2) smart relay agent aka Bug IDs CSCuq24603 CSCur93159 CSCus21693 and CSCut76171.