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Zero days explained: How unknown vulnerabilities become gateways for attackers

April 12, 2021

Zero day definition

A zero day is a security flaw for which the vendor of the flawed system has yet to make a patch available to affected users. The name ultimately derives from the world of digital content piracy: if pirates were able to distribute a bootleg copy of a movie or album on the same day it went on sale legitimately (or maybe even before), it was dubbed a “zero day.”

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