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CVE-2021-28135

MEDIUM
6.5
CVSS Score
Published: September 7, 2021 at 05:56 AM UTC
Updated: June 17, 2026 at 03:45 AM UTC
1 product affected across 1 vendorEsp Idf

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%

Description

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (crash) in ESP32 by flooding the target device with LMP Feature Response data.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_MISCBroken Link
Source: [email protected]
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/espressif/esp-idf
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/espressif/esp32-bt-lib
x_refsource_MISCProduct
Source: [email protected]
https://www.espressif.com/en/products/socs/esp32

CVSS

6.5MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-Other

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