CVE-2021-28135

6.5 mediumEPSS 0.8%

Medium (6.5) in espressif esp-idf. EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
Published: 2021-09-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

espressif:esp-idf

References

https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
https://github.com/espressif/esp-idf
https://github.com/espressif/esp32-bt-lib
https://www.espressif.com/en/products/socs/esp32
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf

Check your stack JSON