Cisco Wireless LAN Controller (WLC) devices 7.0 before 7.0.250.0, 7.2, 7.3, and 7.4 before 7.4.110.0 do not properly deallocate memory, which allows remote attackers to cause a denial of service (reboot) by sending WebAuth login requests at a high rate, aka Bug ID CSCuf52361.
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140305-wlc