Vulnerability Report

CVE-2020-26557

Title: Bluetooth Mesh Profile Auth Bypass

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2020-26557.

CWE Category CWE-287

Published Date May 24, 2021

Modified Date Nov 04, 2025

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

0.95%

Vulnerability Summary

CVE-2020-26557: Mesh 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 provisioning protocol) to determine the AuthValue via a brute-force attack (unless the AuthValue is sufficiently random and changed each time).

Impacted Vendors

bluetooth 1

Reference Links

https://kb.cert.org/vuls/id/799380 https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ https://kb.cert.org/vuls/id/799380 https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ https://www.kb.cert.org/vuls/id/799380

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

ADJACENT_NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

CVSS v2.0

Source Entity [email protected]

Severity LOW

2.9

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:A/AC:M/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2020-26557 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

November 04, 2025 MODIFIED

Vulnerability data or affected products updated.

May 24, 2021 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector ADJACENT_NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.