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What is important is the version of the Management Engine firmware that the system is running. As the document states, "Intel® Management Engine (Intel® ME 8.x-10.x and 11.0.0-11.7.0), Intel® Trusted Execution Engine (Intel® TXE 3.0), and Intel® Server Platform Services (Intel® SPS 4.0)" are all affected. As it turns out, when I checked my Intel NUC systems that utilize 3rd, 4th and 5th generation Core processors, they were *all* running affected versions of the ME firmware. I also confirmed (see here: Intel-SA-00086 for Intel® NUC, Intel® Compute Stick, and Intel® Compute Card) that Intel has released updated BIOSs for all of these NUCs to install the appropriate firmware update.
Bottom line, the statement in the advisory is misleading! Even systems with 3rd generation Core processors can have the vulnerability and will need a fix. I hope that the pinheads at the various board manufacturers realize these systems are affected and are preparing updated BIOS/firmware packages for them.