Ah, thanks I just saw this elsewhere. Looks like anyone with curl can BSOD an unpatched IIS server. Wow, this is pretty bad. I patched last night when I saw this in the news. Scary stuff.
Ah, but it's not IIS, this is something less than IIS called HTTP.sys which is used by SSRS in sql 2008 or 2012. It's also used by some other windows services, so chances are you wouldn't even know you are running http.sys unless your software specifically mentioned it.