CVE-2025-27840

MEDIUM

Espressif ESP32 - Info Disclosure

Title source: llm

Description

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

Exploits (3)

nomisec WRITEUP 11 stars

by demining · poc

https://github.com/demining/Bluetooth-Attacks-CVE-2025-27840

View Code ZIP pw:eip

nomisec SCANNER 10 stars

by em0gi · poc

https://github.com/em0gi/CVE-2025-27840

View Code ZIP pw:eip

nomisec WRITEUP

by ladyg00se · poc

https://github.com/ladyg00se/CVE-2025-27840-WIP

View Code ZIP pw:eip

References (15)

[Technical Description, Third Party Advisory] https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html

[Exploit, Technical Description, Third Party Advisory] https://darkmentor.com/blog/esp32_non-backdoor/

[Technical Description, Third Party Advisory] https://flyingpenguin.com/?p=67838

[Third Party Advisory] https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf

[Product] https://github.com/em0gi/CVE-2025-27840

[Issue Tracking] 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

[Third Party Advisory] https://reg.rootedcon.com/cfp/schedule/talk/5

[Exploit, Press/Media Coverage] 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/

[Press/Media Coverage] https://www.espressif.com/en/news/Response_ESP32_Bluetooth

[Third Party Advisory] https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/

[Third Party Advisory] https://x.com/pascal_gujer/status/1898442439704158276

Scores

CVSS v3 6.8

EPSS 0.0058

EPSS Percentile 69.0%

Attack Vector PHYSICAL

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-912

Status published

Products (1)

espressif/esp32_firmware

Published Mar 08, 2025

Tracked Since Feb 18, 2026