Security features bypass in Bluetooth Mesh profile - CVE-2020-26557
Published: May 26, 2021 / Updated: January 26, 2022
Vulnerability identifier: #VU53582
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-26557
CWE-ID: CWE-254
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the use of predictable AuthValue in the Mesh Provisioning procedure. A remote attacker on the local network can perform a brute-force attack to obtain the AuthValue and authenticate to both the Provisioner and provisioned devices.
Affected software
Bluetooth Mesh profile
ESP-IDF
ESP-IDF
How to mitigate CVE-2020-26557
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
ESP-IDF - addressed in versions 3.3.6, 4.0.3