// For flags

CVE-2021-34145

BRAKTOOTH: Causing Havoc on Bluetooth Link Manager

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Una implementación de Bluetooth Classic en la pila WICED BT de Cypress versiones hasta 2.9.0, para los dispositivos CYW20735B1 no maneja apropiadamente la recepción de LMP_max_slot con un tipo de paquete de banda base no válido (y LT_ADDRESS y LT_ADDR) tras la finalización del procedimiento de configuración de LMP, permitiendo a atacantes en el rango de radio desencadenar una denegación de servicio (bloqueo del firmware) por medio de un paquete LMP diseñado

This whitepaper discusses BRAKTOOTH, a family of new security vulnerabilities in commercial BT stacks that range from denial of service (DoS) via firmware crashes and deadlocks in commodity hardware to arbitrary code execution (ACE) in certain IoTs.

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Adjacent
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-06-07 CVE Reserved
  • 2021-09-03 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cypress
Search vendor "Cypress"
 Wireless Internet Connectivity For Embedded Devices
Search vendor "Cypress" for product "Wireless Internet Connectivity For Embedded Devices"
 <= 2.9.0
Search vendor "Cypress" for product "Wireless Internet Connectivity For Embedded Devices" and version " <= 2.9.0"
-
Affected
in Cypress
Search vendor "Cypress"
 Cyw20735b1
Search vendor "Cypress" for product "Cyw20735b1"
--
Safe