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Vulnerability record · CVE-2021-31615 · published 25 June 2021

CVE-2021-31615: Bluetooth core specification race condition vulnerability

Bluetooth · Bluetooth Core Specification

Unencrypted Bluetooth Low Energy baseband links in Bluetooth Core Specifications 4.0 through 5.2 may permit an adjacent device to inject a crafted packet during the receive window of the listening device before the transmitting device initiates its packet transmission to achieve full MITM status without terminating the link. When applied against devices establishing or using encrypted links, crafted packets may be used to terminate an existing link, but will not compromise the confidentiality or integrity of the link.

5.3 CVSS 3.1 Medium EPSS 0.40% · top 67.8% CWE-362 · Race condition
5.3CVSS 3.1 base score, v2 2.9
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Unencrypted Bluetooth Low Energy baseband links in Bluetooth Core Specifications 4.0 through 5.2 may permit an adjacent device to inject a crafted packet during the receive window of the listening device before the transmitting device initiates its packet transmission to achieve full MITM status without terminating the link. When applied against devices establishing or using encrypted links, crafted packets may be used to terminate an existing link, but will not compromise the confidentiality or integrity of the link.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bluetooth.com Vendor Advisory
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/injectable/ Vendor Advisory
https://bluetooth.com Vendor Advisory
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/injectable/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2022-25836Bluetooth core specification authentication bypass by capture-replay vulnerabilityBluetooth® Low Energy Pairing in Bluetooth Core Specification v4.0 through v5.3 may permit an unauthenticated MITM to acquire credentials with two pa…EPSS 0.37%7.5CVE-2022-25837Bluetooth core specification authentication bypass by capture-replay vulnerabilityBluetooth® Pairing in Bluetooth Core Specification v1.0B through v5.3 may permit an unauthenticated MITM to acquire credentials with two pairing devi…EPSS 0.37%7.5CVE-2020-26556Bluetooth core specification improper restriction of authentication attempts vulnerabilityMesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device, able to conduct a successful brute-force attack on an insuf…EPSS 0.91%6.8CVE-2023-24023Bluetooth core specification vulnerabilityBluetooth BR/EDR devices with Secure Simple Pairing and Secure Connections pairing in Bluetooth Core Specification 4.2 through 5.4 allow certain man-…EPSS 1.3%5.9CVE-2020-15802Bluetooth core specification improper authentication vulnerabilityDevices supporting Bluetooth before 5.1 may allow man-in-the-middle attacks, aka BLURtooth. Cross Transport Key Derivation in Bluetooth Core Specific…EPSS 7.1%5.4CVE-2020-26555Bluetooth core specification incorrect authorization vulnerabilityBluetooth legacy BR/EDR PIN code pairing in Bluetooth Core Specification 1.0B through 5.2 may permit an unauthenticated nearby device to spoof the BD…EPSS 0.88%4.3CVE-2022-24695Bluetooth core specification observable discrepancy vulnerabilityBluetooth Classic in Bluetooth Core Specification through 5.3 does not properly conceal device information for Bluetooth transceivers in Non-Discover…EPSS 0.41%4.3CVE-2020-35473Bluetooth core specification observable discrepancy vulnerabilityAn information leakage vulnerability in the Bluetooth Low Energy advertisement scan response in Bluetooth Core Specifications 4.0 through 5.2, and ex…EPSS 0.35%

Source: NIST National Vulnerability Database (record CVE-2021-31615), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.