What’s Vulnerable › Vulnerabilities

CVE-2020-15802

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-11 · updated 2026-06-17
• Weakness: CWE-287

Description

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 Core Specification: before 5.1 — fixed in 5.1

How to fix

Upgrade to a fixed version: Bluetooth Core Specification 5.1. Check the vendor advisory for mitigations.

References

• https://gizmodo.com/bluetooth-unveils-its-latest-security-issue-with-no-se-1845013709
• https://www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/bluetooth-security/blurtooth/
• https://www.kb.cert.org/vuls/id/589825
• https://gizmodo.com/bluetooth-unveils-its-latest-security-issue-with-no-se-1845013709
• https://www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/bluetooth-security/blurtooth/
• https://www.kb.cert.org/vuls/id/589825

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