Cisco Security Advisory – Cisco Access Points operating in Lightweight Access Point Protocol (LWAPP) mode may allow unauthenticated end hosts to send unencrypted traffic to a secure network by sending frames from the Media Access Control (MAC) address of an already authenticated end host.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/41210/cisco-sa-20051102-lwapp.txt
Source: https://packetstormsecurity.com/files/41210/Cisco-Security-Advisory-20051102-lwapp.html