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Vulnerability record · CVE-2020-26556 · published 24 May 2021

CVE-2020-26556: Bluetooth core specification improper restriction of authentication attempts vulnerability

Bluetooth · Bluetooth Core Specification

Mesh 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 insufficiently random AuthValue before the provisioning procedure times out, to complete authentication by leveraging Malleable Commitment.

7.5 CVSS 3.1 High EPSS 0.91% · top 41.7% CWE-307 · Improper restriction of authentication attempts
7.5CVSS 3.1 base score, v2 2.9
0.91%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Mesh 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 insufficiently random AuthValue before the provisioning procedure times out, to complete authentication by leveraging Malleable Commitment.

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

Affected products

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

References

LinkTags
https://kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ Vendor Advisory
https://www.kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource
https://kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ Vendor Advisory
https://www.kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

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

8.8CVE-2020-26559Bluetooth mesh profile incorrect authorization vulnerabilityBluetooth Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device (participating in the provisioning protocol) to id…EPSS 0.85%8.1CVE-2020-26560Bluetooth mesh profile incorrect authorization vulnerabilityBluetooth Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device, reflecting the authentication evidence from a Pro…EPSS 0.86%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-2020-26557Bluetooth mesh profile improper authentication vulnerabilityMesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device (without possession of the AuthValue used in the provisionin…EPSS 0.83%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%

Source: NIST National Vulnerability Database (record CVE-2020-26556), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.