CVE-2021-28136

MEDIUM 6.5CVE-2021-28136 · Published 07/09/2021 · updated 17/06/2026

In short

CVE-2021-28136 is a MEDIUM (CVSS 6.5) vulnerability affecting esp-idf (espressif).
Chance of exploitation in the next 30 days (EPSS): 0.84%, higher than 57.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
esp-idf espressif	`≤ 4.4`	No fix yet

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.

References

dl.packetstormsecurity.net/papers/general/braktooth.pdf · Technical Description
espressif/esp-idf · Product
espressif/esp32-bt-lib · Product
espressif.com/en/products/socs/esp32 · Product

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Package

Affected versions

Patched versions

esp-idf

espressif

≤ 4.4

No fix yet

Description

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