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newly discovered, and therefore still not fixed and possibly exploited by hackers or other criminals

Additional definitions for 'zero-day':

zero-daybenefiting from newly found and yet unpatched or unmitigated flaw in software or hardware; using zero-day vulnerability
zero-dayUsed other than with a figurative or idiomatic meaning: see zero,‎ day.
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"zero-day." STANDS4 LLC, 2019. Web. 20 Jan. 2019. <>.

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