What does 0-day mean?

0-day in Community Dictionary

1) warez received at the time of, or slightly before, its official (appropriate) release. 2) Information that's not publicly offered until its quickly disseminated in the network. Frequently provides the details of new computer system vulnerabilities, permitting exploiters to comprimise computer system sites before system directors have a chance to secure their networks. by BobbieReport definition
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