The vulnerability, carrying a severity rating of 10 out of a possible 10, resides in the AMI MegaRAC, a widely used firmware package that allows large fleets of servers to be remotely accessed and managed even when power is unavailable or the operating system isn't functioning. These motherboard-attached microcontrollers, known as baseboard management controllers (BMCs), give extraordinary control over servers inside data centers.

Does anybody know of a resource that's compiled known to be affected system or motherboard models using this specific BMC?

Eclypsium said the line of vulnerable AMI MegaRAC devices uses an interface known as Redfish. Server makers known to use these products include AMD, Ampere Computing, ASRock, ARM, Fujitsu, Gigabyte, Huawei, Nvidia, Supermicro, and Qualcomm. Some, but not all, of these vendors have released patches for their wares.