That is terrifying. Messing with thermostats could be enough to kill vulnerable people.

Yes. An excerpt from my initial email to Mysa's security contact…

> I stumbled upon these vulnerabilities on one of the coldest days of this winter in Vancouver. An attacker using them could have disabled all Mysa-connected heaters in the America/Vancouver timezone in the middle of the night. That would include the heat in the room where my 7-month-old son sleeps.