Cisco issued a security advisory for its  1100 and 1200 Series access lightweight points. The advisory is based on work done by wifi IDS firm AirMagnet. Cisco uses an Over-The-Air-Provisioning (OTAP) protocol that uses multicast data to find a controller. During this initialization phase, a rogue controller could respond and send a bad configuration to the access point, disabling the device.

Cisco provides an advisory here: http://tools.cisco.com/security/center/viewAlert.x?alertId=18919 .

The quick summary: Establish basic configuration options like encryption keys and preferred controller lists before deploying the device.