CVEvulnerability

CVE-2020-11957

7.5 HIGH Published 2020-06-09 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-06-09
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
5.4 MEDIUM — AV:A/AC:M/Au:N/C:P/I:P/A:P
Weaknesses
CWE-331

Description

The Bluetooth Low Energy implementation in Cypress PSoC Creator BLE 4.2 component versions before 3.64 generates a random number (Pairing Random) with significantly less entropy than the specified 128 bits during BLE pairing. This is the case for both authenticated and unauthenticated pairing with both LE Secure Connections as well as LE Legacy Pairing. A predictable or brute-forceable random number allows an attacker (in radio range) to perform a MITM attack during BLE pairing.

Affected configurations

• cypress psoc 4.2 ble (< 3.64)

Related

Weakness · CWE (1)

  • CWE-331 Insufficient Entropy weakness

References