Cisco has posted an advisory that may affect you if you are using a Cisco AP OR THE FOLLOWING:
Cisco Aironet 1400 Series Wireless Bridges

Cisco Aironet 1300 Series Access Points

Cisco Aironet 1240AG Series Access Points

Cisco Aironet 1230AG Series Access Points

Cisco Aironet 1200 Series Access Points

Cisco Aironet 1130AG Series Access Points

Cisco Aironet 1100 Series Access Points

Cisco Aironet 350 Series Access Points running IOS
.please go to the cisco site for more Info.
A Dos attack may be launched .