CVE-2020-11957

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La implementación de Bluetooth Low Energy en el componente Cypress PSoC Creator BLE 4.2 versiones anteriores a 3.64, genera un número aleatorio (Pairing Random) con significativamente menos entropía que los 128 bits especificados durante el emparejamiento BLE. Este es el caso tanto para el emparejamiento autenticado como para el autenticado con LE Secure Connections y LE Legacy Pairing. Un número aleatorio predecible o aplicable de fuerza bruta permite a un atacante (en el alcance del radio) llevar a cabo un ataque MITM durante el emparejamiento BLE

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-04-20 CVE Reserved
2020-06-09 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-331: Insufficient Entropy

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.cypress.com/file/504466/download	2020-06-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cypress Search vendor "Cypress"		Psoc 4.2 Ble Search vendor "Cypress" for product "Psoc 4.2 Ble"				< 3.64 Search vendor "Cypress" for product "Psoc 4.2 Ble" and version " < 3.64"		-		Affected