The past five years of Intel contain an unfixable flaw

[DelJo63]

So says says arstechnica.com/

The flaw resides in the Converged Security and Management Engine, a subsystem inside Intel CPUs and chipsets that’s roughly analogous to AMD’s Platform Security Processor. Often abbreviated as CSME, this feature implements the firmware-based Trusted Platform Module used for silicon-based encryption, authentication of UEFI BIOS firmware, Microsoft System Guard and BitLocker, and other security features. The bug stems from the failure of the input-output memory management unit—which provides protection preventing the malicious modification of static random-access memory—to implement early enough in the firmware boot process. That failure creates a window of opportunity for other chip components, such as the Integrated Sensor Hub, to execute malicious code that runs very early in the boot process with the highest of system privileges​

see the link above for details