// For flags

CVE-2021-34146

BRAKTOOTH: Causing Havoc on Bluetooth Link Manager

Severity Score

6.5
*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 CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.

Una implementación de Bluetooth Classic en el Cypress CYW920735Q60EVB no maneja apropiadamente la recepción de respuestas LMP continuas no solicitadas, permitiendo a atacantes en el rango de radio desencadenar una denegación de servicio y reinicio (crash) del dispositivo al inundarlo con paquetes LMP_AU_Rand después del procedimiento de paginación

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
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* 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"
 Cyw920735q60evb-01 Firmware
Search vendor "Cypress" for product "Cyw920735q60evb-01 Firmware"
--
Affected
in Cypress
Search vendor "Cypress"
 Cyw920735q60evb-01
Search vendor "Cypress" for product "Cyw920735q60evb-01"
--
Safe
Cypress
Search vendor "Cypress"
 Cyw20735b1 Firmware
Search vendor "Cypress" for product "Cyw20735b1 Firmware"
--
Affected
in Cypress
Search vendor "Cypress"
 Cyw20735b1
Search vendor "Cypress" for product "Cyw20735b1"
--
Safe