# Undocumented commands found in Bluetooth chip used by a billion devices

**URL:** <https://community.limacharlie.com/t/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/136>\
**Category:** Community Intel\
**Created:** [March 13, 2025, 3:40pm UTC](https://community.limacharlie.com/t/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/136 "2025-03-13T15:40:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Christopher\_Luft](https://yyz1.discourse-cdn.com/flex033/user_avatar/community.limacharlie.com/christopher_luft/32/129_2.png) [@Christopher\_Luft](https://community.limacharlie.com/u/Christopher_Luft)\
**Post date:** [March 13, 2025, 3:40pm UTC](https://community.limacharlie.com/t/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/136/1 "2025-03-13T15:40:23Z")

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Researchers have discovered an undocumented backdoor in a widely used Bluetooth chip from manufacturer **Espressif Systems** , potentially affecting over a billion devices. The backdoor allows attackers to gain remote access by exploiting a hidden command mode, posing a significant security risk to IoT devices, smart home products, and industrial systems. Espressif has acknowledged the issue and is working on a firmware update to mitigate the threat.

> **[Undocumented commands 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/)**
>
> The ubiquitous ESP32 microchip made by Chinese manufacturer Espressif and used by over 1 billion units as of 2023 contains undocumented commands that could be leveraged for attacks.