Bluetooth headphones can be used to hack a smartphone
It turns out that this protocol remains active in serial headphones and does not require authentication. This means that an attacker, being within Bluetooth range, can connect to the headphones without attracting the owner's attention. By gaining access to RACE, the hacker obtains extended rights to control the device. In their findings, the researchers noted that they were able not only to read and modify data in the headphones' memory but also to obtain information about the