Analysis of more than 73,000 Macs showed that some 4.2% of them were running the wrong firmware, leaving them vulnerable to attacks like Thunderstrike. For one model, the percentage was a staggering 43%.

Firmware exploits are among the most dangerous, because they potentially give an attacker complete control of a machine, are not detected by macOS security scans and remain in place even if you format or replace a drive and do a fresh install of macOS …

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