medium6.8
CVE-2025-27840
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Impact
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Espressif | Esp32 Firmware | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html
- https://darkmentor.com/blog/esp32_non-backdoor/
- https://flyingpenguin.com/?p=67838
- https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf
- https://github.com/em0gi/CVE-2025-27840
- https://github.com/esphome/esphome/discussions/8382
- https://github.com/orgs/espruino/discussions/7699
- https://news.ycombinator.com/item?id=43301369
- https://news.ycombinator.com/item?id=43308740
- https://reg.rootedcon.com/cfp/schedule/talk/5
- https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
- https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/
- https://www.espressif.com/en/news/Response_ESP32_Bluetooth
- https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/
- https://x.com/pascal_gujer/status/1898442439704158276