The SNMP implementation in Cisco Adaptive Security Appliance (ASA) Software 8.4(7) and 8.6(1.2) allows remote authenticated users to cause a denial of service (device reload) by sending many SNMP requests during a time of high network traffic, aka Bug ID CSCul02601.
http://www.securitytracker.com/id/1032776
http://tools.cisco.com/security/center/viewAlert.x?alertId=39611