CVE-2025-27840 Security feature bypass in ESP32
Hidden HCI commands in Espressif ESP32 chips allow attackers to write memory, potentially enabling code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-27840?
CVE-2025-27840 is a medium-severity vulnerability in Espressif ESP32, published on 8 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
Weakness: CWE-912
Which versions are affected by CVE-2025-27840?
It affects 1 product.
Products include Espressif Esp32 Firmware.
How do I fix CVE-2025-27840?
No fix has been published for CVE-2025-27840 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-27840 being exploited?
There is no known exploitation of CVE-2025-27840 in the wild and no public exploit code.
Public exploit code: 4 proofs of concept on GitHub.
Other vulnerabilities in Espressif ESP32
Sources
Also known as GHSA-jfwf-rfmg-7f8m.