CVE-2025-27840

Published: Mar 8, 2025

Modified: May 12, 2025

PUBLISHED

CVSS v3.1

6.8

MEDIUM

Description

Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).

Vendor	Product	Versions
Espressif	ESP32	affected `2025-03-06`

Weaknesses (CWE)

CWE-912

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

Attack Vector

Physical

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

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

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CVE-2025-27840

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References