Cisco Wireless LAN Controller (WLC) devices with software 7.0(240.0), 7.3(101.0), and 7.4(1.19) allow remote attackers to cause a denial of service (device outage) by sending malformed 802.11i management data to a managed access point, aka Bug ID CSCub65236.
http://www.securitytracker.com/id/1033731
http://tools.cisco.com/security/center/viewAlert.x?alertId=41249