A Work-In-Progress for CVE-2025-27840 # CVE-2025-27840-WIP
A Work-In-Progress for CVE-2025-27840
# CVE-2025-27840 Overview
**CVE-2025-27840** is a medium-severity vulnerability (**CVSS 6.8**) affecting Espressif **ESP32 Bluetooth chips**, which are integrated into over 1 billion IoT devices globally. The flaw involves **29 undocumented Host Controller Interface (HCI) commands** that could enable unauthorized memory access and device control.
## 🔧 Key Technical Details
- Affects **ESP32 firmware version 2025-03-06**
- **Critical command `0xFC02`** allows direct memory writing
- Requires **physical access or privileged rights** for exploitation
## ⚠️ Potential Risks
- Device spoofing and unauthorized data access
- Network pivoting and persistent threats
- Potential compromise of **medical devices**, **smart locks**, and **industrial systems**
## 🛡️ Mitigation Status
- **Espressif disputes** backdoor claims but plans to **remove undocumented commands** in future updates
- **Proof-of-concept exploit** code exists, though **active exploitation remains unconfirmed**
- For detection, **SOC Prime** offers threat rules compatible with **40+ security platforms**
- Organizations should **monitor for patches** and **restrict physical access** to vulnerable devices
> **Note:** While initially reported as a backdoor, Espressif clarified that exploitation **requires privileged access**, reducing immediate risk.
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