https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
"In total, they found 29 undocumented commands, collectively characterized as a "backdoor," that could be used for memory manipulation (read/write RAM and Flash), MAC address spoofing (device impersonation), and LMP/LLCP packet injection."

Edit: Headline got me, frustrating as someone trying to keep up with these to have to dig through comments to get accurate information. I tried to be diligent and carefully read the article, but the outcome was still lesser than skimming the commments.

Previous: Well that sucks. Consumer level security might all be just theater.