CVE-2021-28136

BRAKTOOTH: Causing Havoc on Bluetooth Link Manager

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of multiple LMP IO Capability Request packets during the pairing process, allowing attackers in radio range to trigger memory corruption (and consequently a crash) in ESP32 via a replayed (duplicated) LMP packet.

Una implementación de Bluetooth Classic en Espressif ESP-IDF versiones 4.4 y anteriores, no maneja apropiadamente la recepción de múltiples paquetes de petición de capacidad LMP IO durante el proceso de emparejamiento, permitiendo a atacantes en el rango de radio desencadenar una corrupción de la memoria (y en consecuencia un bloqueo) en el ESP32 por medio de un paquete LMP reproducido (duplicado)

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

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

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-11 CVE Reserved
2021-09-03 CVE Published
2024-08-03 CVE Updated
2025-06-25 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (4)

URL	Tag	Source
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf	Technical Description
https://github.com/espressif/esp-idf	Product
https://github.com/espressif/esp32-bt-lib	Product

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.espressif.com/en/products/socs/esp32	2021-09-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Espressif Search vendor "Espressif"	Esp-idf Search vendor "Espressif" for product "Esp-idf"	<= 4.4 Search vendor "Espressif" for product "Esp-idf" and version " <= 4.4"	-	Affected	in	Espressif Search vendor "Espressif"	Esp32 Search vendor "Espressif" for product "Esp32"	-	-	Safe