Eh, the issue was found by a random (Chinese) guy on the internet. And it was reported to Microsoft in the beginning of January. It got leaked and once you have

Eh, the issue was found by a random (Chinese) guy on the internet. And it was reported to Microsoft in the beginning of January. It got leaked and once you have the exploit chain - yeah, pretty much any random guy on the internet could use it for hacking. A few days after MS disclosure there were in fact independently produced exploits by other random guys.