We are currently on ColdFusion 10 Update 21 which I believe is current. I'm aware Version 10's Core Support ends May 16, 2017 and the End of Extended Support ends May 16, 2019. We do not currently have a support agreement with Adobe for ColdFusion but we do still get the Update Availability notifications in ColdFusion Administrator. Will these update availability's continue to show up in Administrator after the End of Core Support?
Once the Core support for the product ends, Adobe will not release any official patch/updates for ColdFusion. Extended support means that you will get support but not the patch.
Hope this helps.