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Allegedly a supply chain attack on Supermicro's servers installed small CPUs disguised as passive capacitors on the mainboard that were able to take over the BMC, which could then compromise the main CPU:
https://www.bloomberg.com/news/features/2018-10-04/the-big-hack-how-china-used-a-tiny-chip-to-infiltrate-america-s-top-companies?srnd=premium