Cisco issued an alert over all of its wireless LAN controllers, warning denial-of-service attacks could cause its controllers to hang or reload. One of the vulnerabilities is specific to one particular software version that could allow a restricted user to gain full administrative rights. Cisco has posted software patches for them. Article [1]
Links:
[1] http://www.techworld.com/mobility/news/index.cfm?newsID=110499&pagtype=samechan