Microsoft is aware of the Bluetooth BR/EDR (basic rate/enhanced data rate, known as "Bluetooth Classic") key negotiation vulnerability that exists at the hardware specification level of any BR/EDR Bluetooth device. An attacker could potentially be able to negotiate the offered key length down to 1 byte of entropy, from a maximum of 16 bytes. To exploit this vulnerability, an attacker would need specialized hardware and would be limited by the range of the Bluetooth devices in use. Using this specialized equipment, they would need to be close enough to communicate and interfere with the legitimate transmissions being made wirelessly.