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CVE-2025-27840

Quick assessment

Affected
Espressif ESP32
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Espressif ESP32是中国乐鑫（Espressif）公司的一款单片机微控制器。 Espressif ESP32存在安全漏洞，该漏洞源于隐藏的HCI命令可能导致内存写入。

CVSS 6.8 · Medium EPSS 1.36% · P71
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I. Basic Information for CVE-2025-27840

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
隐藏功能
Source: CVE Program / CVE List V5
Vulnerability Title
Espressif ESP32 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Espressif ESP32是中国乐鑫（Espressif）公司的一款单片机微控制器。 Espressif ESP32存在安全漏洞，该漏洞源于隐藏的HCI命令可能导致内存写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Espressif ESP32 2025-03-06 -

II. Public POCs for CVE-2025-27840

# POC Description Source Link Shenlong Link
1 Expanded version of the code shown at RootedCON redone in python - CVE-2025-27840 https://github.com/em0gi/CVE-2025-27840 POC Details
2 Bitcoin Cryptanalysis: CVE-2025-27840 Vulnerability in ESP32 Microcontrollers Puts Billions of IoT Devices at Risk via Wi-Fi & Bluetooth https://github.com/demining/Bluetooth-Attacks-CVE-2025-27840 POC Details
3 A Work-In-Progress for CVE-2025-27840 https://github.com/ladyg00se/CVE-2025-27840-WIP POC Details
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III. Intelligence Information for CVE-2025-27840

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Vendor Advisories for CVE-2025-27840 (1)

Proof of Concept for CVE-2025-27840 (1)

Security Blog Posts for CVE-2025-27840 (5)

News Coverage for CVE-2025-27840 (6)

Other References for CVE-2025-27840 (1)

IV. Related Vulnerabilities

Same vendor: Espressif
Same weakness: CWE-912

V. Comments for CVE-2025-27840

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