CVE-2021-28136

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.

• CWE-787

• https://dl.packetstormsecurity.net/papers/general/braktooth.pdfTechnical Description, Third Party Advisory
• https://github.com/espressif/esp-idfProduct, Third Party Advisory
• https://github.com/espressif/esp32-bt-libProduct, Third Party Advisory
• https://www.espressif.com/en/products/socs/esp32Product, Vendor Advisory
• https://dl.packetstormsecurity.net/papers/general/braktooth.pdfTechnical Description, Third Party Advisory
• https://github.com/espressif/esp-idfProduct, Third Party Advisory
• https://github.com/espressif/esp32-bt-libProduct, Third Party Advisory
• https://www.espressif.com/en/products/socs/esp32Product, Vendor Advisory

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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