Description
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Metrics
CVSS 3.1 6.8/10
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Espressif | ESP32 | 2025-03-06 |
References
- https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.htmlTechnical Description, Third Party Advisory
- https://darkmentor.com/blog/esp32_non-backdoor/Exploit, Technical Description, Third Party Advisory
- https://flyingpenguin.com/?p=67838Technical Description, Third Party Advisory
- https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdfThird Party Advisory
- https://github.com/em0gi/CVE-2025-27840Product
- https://github.com/esphome/esphome/discussions/8382Issue Tracking
- https://github.com/orgs/espruino/discussions/7699Issue Tracking
- https://news.ycombinator.com/item?id=43301369Issue Tracking
- https://news.ycombinator.com/item?id=43308740Issue Tracking
- https://reg.rootedcon.com/cfp/schedule/talk/5Third Party Advisory
- https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/Exploit, Press/Media Coverage
- https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/Exploit, Press/Media Coverage
- https://www.espressif.com/en/news/Response_ESP32_BluetoothPress/Media Coverage
- https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/Third Party Advisory
- https://x.com/pascal_gujer/status/1898442439704158276Third Party Advisory
Timeline
- Published
- Mar 8, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed