Definition of zero-day in English:

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Deriving from or relating to a previously unknown vulnerability to attack in some software: the service is designed to detect all manner of malware, including zero-day threats
More example sentences
  • The point seemed to be to create a zero-day exploit, which he didn't have a chance of managing.
  • We're offering zero-day protection, stability, and configuration control.
  • There were unexpected zero-day attacks causing a half-day network outage.

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Line breaks: zero-day

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