CVEvulnerability
CVE-2025-27840
6.8 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2025-03-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.8 MEDIUM — CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
- CVSS 3.1 ([email protected])
- 6.8 MEDIUM — CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- Weaknesses
- CWE-912
Description
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Affected configurations
• espressif esp32 firmware
Related
Weakness · CWE (1)
- CWE-912 Hidden Functionality weakness
References
- https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html Technical Description, Third Party Advisory
- https://darkmentor.com/blog/esp32_non-backdoor/ Exploit, Technical Description, Third Party Advisory
- https://flyingpenguin.com/?p=67838 Technical Description, Third Party Advisory
- https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf Third Party Advisory
- https://github.com/em0gi/CVE-2025-27840 Product
- https://github.com/esphome/esphome/discussions/8382 Issue Tracking
- https://github.com/orgs/espruino/discussions/7699 Issue Tracking
- https://news.ycombinator.com/item?id=43301369 Issue Tracking
- https://news.ycombinator.com/item?id=43308740 Issue Tracking
- https://reg.rootedcon.com/cfp/schedule/talk/5 Third 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_Bluetooth Press/Media Coverage
- https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/ Third Party Advisory
- https://x.com/pascal_gujer/status/1898442439704158276 Third Party Advisory