So, for those who don't know: Your MyCloud will spam you six times a day about firmware updates if you didn't update. They replaced the vulnerable OS back in March. So people probably should know/have done this by now. It's hardly a zero-day at this point: It was fixed months ago.
Second, and I feel like this should be obvious: People should not be exposing their NAS appliance directly to the Internet! Stop doing it. Just don't. If you do, you deserve what you get, because you intentionally went into your consumer-grade firewall and poked a hole in it.