[scintill76]

Does Apple's firmware support Secure Boot? I've always heard of it in connection with Windows 8+. If they support it, is it enabled by default? If either answer is "no", it seems like the Option ROM vuln is pretty severe for Macs.

[Sanddancer]

It's neither enabled, nor supported on Apple machines. Apple's not using UEFI, they're using their own fork of EFI 1.10