A series of vulnerabilities in Thunderbolt 2 and 3, collectively called ‘Tunderspy,’ can leave your Mac open to hacking.

Security researcher Björn Ruytenberg with the Eindhoven University of Technology recently published a report detailing a series of serious security vulnerabilities in Thunderbolt 2 and Thunderbolt 3, collectively called “Thunderspy.”

They affect every single computer with a Thunderbolt 2 or Thunderbolt 3 port, including old-style port connectors and new Type-C connectors, whether the computers are running Windows, Linux, or macOS.
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https://www.macworld.com/article/3542683/major-thunderbolt-security-flaw-found-in-macs-and-pcs-should-you-be-worried.html