CVE-2021-28135

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.

• https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
• https://github.com/espressif/esp-idfThird Party Advisory
• https://github.com/espressif/esp32-bt-libThird Party Advisory
• https://www.espressif.com/en/products/socs/esp32Product
• https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
• https://github.com/espressif/esp-idfThird Party Advisory
• https://github.com/espressif/esp32-bt-libThird Party Advisory
• https://www.espressif.com/en/products/socs/esp32Product

Published

Sep 7, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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