Yikes, from an article that contains a lot more detail, but just to get your attention as to the impact part:
«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.
The undocumented commands allow spoofing of trusted devices, unauthorized data access, pivoting to other devices on the network, and potentially establishing long-term persistence.
…
"Exploitation of this backdoor would allow hostile actors to conduct impersonation attacks and permanently infect sensitive devices such as mobile phones, computers, smart locks or medical equipment by bypassing code audit controls."
The researchers warned that ESP32 is one of the world's most widely used chips for Wi-Fi + Bluetooth connectivity in IoT (Internet of Things) devices, so the risk is significant.»
People worried about this topic might also "enjoy" the recent Netflix series Zero Day.
And not to get too far afield, but hopefully it also didn't escape notice that there have been broad firings of qualified people in the US government for reasons related not to their technical skill or ability to protect our nation from issues like this, but because of irrelevant details of their private lives or personal leanings on issues of having fair and competent government, helping the needy, defending individual human freedom and dignity, or avoiding mass death in myriad ever-more-likely ways.
https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/
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How revolutionary! At this rate, we'll have 73 different "alternative" browsers before anyone notices they all just render the same cat memes. 
