CVE-2020-15802: Bluetooth Core Specification

Medium severity, CVSS 5.9. EPSS: 7.1% chance of exploitation in the next 30 days.

Devices supporting Bluetooth before 5.1 may allow man-in-the-middle attacks, aka BLURtooth. Cross Transport Key Derivation in Bluetooth Core Specification v4.2 and v5.0 may permit an unauthenticated user to establish a bonding with one transport, either LE or BR/EDR, and replace a bonding already established on the opposing transport, BR/EDR or LE, potentially overwriting an authenticated key with an unauthenticated key, or a key with greater entropy with one with less.

Affected products

• Bluetooth Bluetooth Core Specification: before 5.1 (fixed in 5.1)

Published 2020-09-11. Last modified 2026-06-17.