CVE-2025-27840

March 12, 2025, 2:58 p.m.

6.8
Medium

Description

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

Product(s) Impacted

Vendor Product Versions
Espressif
  • Esp32 Firmware
  • Esp32
  • -
  • -

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-912
Hidden Functionality
The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
o espressif esp32_firmware - / / / / / / /
h espressif esp32 - / / / / / / /

References

https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html
https://darkmentor.com/blog/esp32_non-backdoor/
https://flyingpenguin.com/?p=67838
https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf
https://github.com/em0gi/CVE-2025-27840
https://github.com/esphome/esphome/discussions/8382
https://github.com/orgs/espruino/discussions/7699
https://news.ycombinator.com/item?id=43301369
https://news.ycombinator.com/item?id=43308740
https://reg.rootedcon.com/cfp/schedule/talk/5
https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/
https://www.espressif.com/en/news/Response_ESP32_Bluetooth
https://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/
https://x.com/pascal_gujer/status/1898442439704158276

Tags

cve@mitre.org
CWE-912
NVD-CWE-Other
2025-03-08
CVE-2025-27840

CVSS Score

6.8 / 10

CVSS Data - 3.1

  • Attack Vector: PHYSICAL
  • Attack Complexity: HIGH
  • Privileges Required: HIGH
  • Scope: CHANGED
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: LOW

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

    View Vector String

Timeline

Published: March 8, 2025, 8:15 p.m.
Last Modified: March 12, 2025, 2:58 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

cve@mitre.org

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.