Bluetooth BR/EDR devices with Secure Simple Pairing and Secure Connections pairing in Bluetooth Core Specification 4.2 through 5.4 allow certain man-in-the-middle attacks that force a short key length, and might lead to discovery of the encryption key and live injection, aka BLUFFS.
Exploitability
AV:AAC:HPR:NUI:RScope
S:UImpact
C:HI:HA:N6.4/CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N