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CVE-2021-28136

MEDIUM
6.5
CVSS Score
Published: September 7, 2021 at 05:52 AM UTC
Updated: June 17, 2026 at 03:45 AM UTC
2 products affected across 1 vendorEsp IdfEsp32

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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 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.

Affected

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

Esp Idf· Espressif
95%
v ≤ 4.4
espressif-esp32 (environment)
Esp32· Espressifdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCTechnical DescriptionThird Party Advisory
Source: [email protected]
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
x_refsource_MISCProductThird Party Advisory
Source: [email protected]
https://github.com/espressif/esp-idf
x_refsource_MISCProductThird Party Advisory
Source: [email protected]
https://github.com/espressif/esp32-bt-lib
x_refsource_MISCProductVendor Advisory
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
CWE-787

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