Many Xeon SKUs include the Management Engine, which at times has seemed to share many of the features of AMT/SBT/etc, but its unclear on the exact attack vector for this vulnerability.

Having said that, the ME is so opaque, the same type of vulnerability could easily exist.

There are Xeons with AMT, at least the 3400, possibly more.

edit: E3-1200 as well, same kind of application, single CPU workstation chip.