CVE-2025-27840

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

6.8 MediumPublic exploit

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

Attack profile

How easy it is to exploit

Attack vector: Physical
Complexity: High
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: Low

Exploit likelihood

1.36%Up 1.3 points since Mar 9, 2025

What each source reports

CVE List Score used 6.8

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

Record: CVE-2025-27840
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Weakness: CWE-912
Updated: 2026-11-02

EUVDEUVD-2025-7816 6.8

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

Record: EUVD-2025-7816
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-jfwf-rfmg-7f8m 6.8

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

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

Record: GHSA-jfwf-rfmg-7f8m
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Weakness: CWE-912
Updated: 2026-11-02

NVD 6.8

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

Record: CVE-2025-27840
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Weakness: CWE-912
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	JasonW88/esp32-cve-2025-27840-power-trace-experiment	2026-08-05
PoC in GitHub	demining/Bluetooth-Attacks-CVE-2025-27840	2025-03-30
PoC in GitHub	em0gi/CVE-2025-27840	2025-03-09
PoC in GitHub	v3ilsm1th/CVE-2025-27840-WIP	2025-04-08

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-27840 is a medium vulnerability (CVSS 6.8) in Espressif Esp32, published March 8, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.36%, the 71st percentile. No source names a fixed version.

References

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