CVE-2020-26556

Name: CVE-2020-26556
Creator: NVD / NIST
Published: 2021-05-24T18:15:07.873+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2020-26556 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.91%

55.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Bluetooth	Bluetooth Core Specification	>= 1.0b, <= 5.2
Bluetooth	Mesh Profile	1.0.0
Bluetooth	Mesh Profile	1.0.1

References

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

Timeline

Published: May 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26556?

How severe is CVE-2020-26556?

CVE-2020-26556 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST