!!! Overview
[{$pagename}] is an unknown [Vulnerability] or unaddressed [exploit].

"Day Zero" is the day on which the interested party, presumably the vendor of the targeted system, learns of the [vulnerability].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Zero-day_(computing)|Wikipedia:Zero-day_(computing)|target='_blank'] - based on information obtained 2019-08-12