KNOB, which is short for Key Negotiation of Bluetooth, is a security flaw that’s present in the Bluetooth communication protocol.
According to the security researchers, almost all Bluetooth devices on the market are prone to KNOB attacks. The researchers revealed the flaw in late 2018 to the industry, namely the Bluetooth Special Interest Group (Bluetooth SIG), as well as the CERT Coordination Center and the International Consortium for Advancement of Cybersecurity on the Internet (ICASI).
This security flaw is pressing enough for Bluetooth SIG to update the Bluetooth Core Specification. The exploit involves the attacker attempting to interfere with the Bluetooth BR/EDR (Bluetooth Basic Rate/ Enhanced Data Rate) communication between two Bluetooth devices during their pairing.