Cisco NX-OS 7.1(1)N1(1) on Nexus 5500, 5600, and 6000 devices does not properly validate PDUs in SNMP packets, which allows remote attackers to cause a denial of service (SNMP application restart) via a crafted packet, aka Bug ID CSCut84645.
http://www.securitytracker.com/id/1035158
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-n5ksnmp