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That left many Macs open to hacks like the “Thunderstrike” attack, where hackers can control a Mac after plugging an Ethernet adapter into the machine’s so-called thunderbolt port.

That left many Macs open to hacks like the “Thunderstrike” attack, where hackers can control a Mac after plugging an Ethernet adapter into the machine’s so-called thunderbolt port.

The other serious Apple bug of the summer, Thunderstrike 2, which allowed attackers to overwrite a Mac’s firmware, was at least somewhat fixed in the most recent update, Mac OS X 10.10.4.

Rich Mogull, a Mac security expert who covers the platform on the TidBITS news site, wrote that Thunderstrike 2 is less severe than it was made out to be.

The most notable part of the Thunderstrike 2 vulnerability – which lets attackers create a “worm” which can spread from computer to computer without human intervention – remains unfixed, though some experts have questioned its seriousness.