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…
Does this matter?
Lower severity and a low EPSS score (0.82%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.82% probability · 57th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- espressif/esp-idf
- Source
- cve@mitre.org
EPSS 0.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.