The wireless web-authentication subsystem on Cisco Wireless LAN Controller (WLC) devices 7.5.x and 7.6.x before 7.6.120 allows remote attackers to cause a denial of service (process crash and device restart) via a crafted value, aka Bug ID CSCum03269.
http://www.securitytracker.com/id/1032277
http://tools.cisco.com/security/center/viewAlert.x?alertId=38749