The Network Analysis Module (NAM) in Cisco Catalyst Series 6000, 6500, and 7600 allows remote attackers to execute arbitrary commands via certain SNMP packets that are spoofed from the NAM's own IP address.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5188
https://exchange.xforce.ibmcloud.com/vulnerabilities/32750
http://www.vupen.com/english/advisories/2007/0783
http://www.securitytracker.com/id?1017710
http://www.securityfocus.com/bid/22751
http://www.kb.cert.org/vuls/id/472412
http://www.cisco.com/warp/public/707/cisco-sa-20070228-nam.shtml