CVE-2025-27840

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

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.3 / Impact : 6.0

Attack Vector PHYSICAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:espressif:esp32_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:espressif:esp32:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-03-08 20:15

Updated : 2025-03-12 14:58

NVD link : CVE-2025-27840

Mitre link : CVE-2025-27840

CVE.ORG link : CVE-2025-27840

JSON object : View

Products Affected

espressif

esp32
esp32_firmware

CWE

CWE-912

Hidden Functionality

NVD-CWE-Other

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