So tonight on your wsus MS11-100 sync’d up. An out of band .net update.
On workstations I see no need to rush here. In fact I see low risk if you decide to pass on this update.
On servers, unless it’s a public facing web server, I’m not seeing a huge rush either.
For anyone running high targeted cloud servers, you not only need to be concerned about .net but ruby, java and apache patching as well as this is a hash table denial of service for lots of web servers.
But for us normal folks…. this is not an out of band that I would be freaking out over.