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CVE-2019-9506

hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB)

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Severity

Important

Red Hat Product Security

7

CVSS 3.0

Review impact separately from score.

Published · August 10, 2019

Updated · June 28, 2026

Description

A flaw was discovered in the Bluetooth protocol. An attacker within physical proximity to the Bluetooth connection could downgrade the encryption protocol to be trivially brute forced.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

At this time there is no known mitigation if bluetooth hardware is to be continue to be used. Replacing the hardware with its wired version and disabling bluetooth may be a suitable alternative for some environments.

CVSS / CWE

CVSS 3.0 · 7
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm