CVE-2025-27840
- State
- Published
- Severity
- 6.8 Medium
- Published
- Mar 8, 2025
- Updated
- May 12, 2025
- Reserved
- Mar 8, 2025
Description
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.8 Medium | CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L | mitre |
Weaknesses
- CWE-912 Hidden Functionality
Affected Products
| Product | Versions |
|---|---|
ESP32Espressif |
|
References
- https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf
- https://x.com/pascal_gujer/status/1898442439704158276
- https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/
- https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
- https://reg.rootedcon.com/cfp/schedule/talk/5
- https://flyingpenguin.com/?p=67838
- https://github.com/em0gi/CVE-2025-27840
- https://github.com/orgs/espruino/discussions/7699
- https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/
- https://darkmentor.com/blog/esp32_non-backdoor/
- https://news.ycombinator.com/item?id=43308740
- https://news.ycombinator.com/item?id=43301369
- https://github.com/esphome/esphome/discussions/8382
- https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html
- https://www.espressif.com/en/news/Response_ESP32_Bluetooth
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.