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CVE-2019-9506

HighPublished

Blutooth BR/EDR specification does not specify sufficient encryption key length and allows an attacker to influence key length negotiation

Published: Aug 14, 2019
Updated: Sep 16, 2024
Assigning CNA: certcc
Evidence observed: Aug 6, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS probability estimate

2.7%

Low · next 30 days

Percentile: 85.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.

Sources

knobExploit
Implementation of Key Negotiation Of Bluetooth (KNOB) attacks targeting Bluetooth BR/EDR and BLE, exploiting CVE-2019-9506 for security research and vulnerability testing.
knobPoC
Key Negotiation Of Bluetooth (KNOB) attacks on Bluetooth BR/EDR and BLE [CVE-2019-9506]

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