CVE-2019-9506
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
nvd · CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NLow · next 30 days
- Percentile
- 85.5%
- Model date
- Oct 13, 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
- knobPoC
Key Negotiation Of Bluetooth (KNOB) attacks on Bluetooth BR/EDR and BLE [CVE-2019-9506]
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