What is CVE-2020-15802?

CVE-2020-15802 is a medium-severity vulnerability in Bluetooth Core Specification, classified under Improper Authentication. CVSS score: 5.9/10. Published 2020-09-11.

How severe is CVE-2020-15802?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2020-15802 known to be exploited?

14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Bluetooth Core Specification

CVE-2020-15802

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.

Vulnerability class: Broken Authentication

Published 2020-09-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.071 (94.2th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.071 · newest: 0.071 · change: 0.000

Affected products

Bluetooth Core Specification

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

www.kb.cert.org/vuls/id/589825 (US Government Resource, Third Party Advisory)
gizmodo.com/bluetooth-unveils-its-latest-security-issue-with-no-se-1845013709 (Third Party Advisory)
www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/bluetooth-security… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-15802?: CVE-2020-15802 is a medium-severity vulnerability in Bluetooth Core Specification, classified under Improper Authentication. CVSS score: 5.9/10. Published 2020-09-11.
How severe is CVE-2020-15802?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2020-15802 known to be exploited?: 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.