CVE-2019-9506

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of data exposure, data tampering.

Exploit odds

2.7% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2019-08-14 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:43 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.7% in the next 30 days (EPSS).
• Severity: 8.1 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2019-08-14 17:15 UTC

Last modified

2026-06-17 02:43 UTC

Exploit probability

2.7% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Google Android
• Apple Iphone Os 12.4
• Apple Mac Os X 10.12.6
• Apple Mac Os X 10.13.6
• Apple Mac Os X 10.14.5
• Apple Tvos 12.4
• Apple Watchos 5.3
• Canonical Ubuntu Linux 16.04

Attack profile CVSS 3.1 · 8.1

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

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