What is a Zero-Day (0-Day)? | UpGuard
https://www.upguard.com/blog/zero-day
Webupdated Jun 29, 2023. A zero-day (0-day) is an unpatched security vulnerability that is unknown to the software, hardware or firmware developer, and the exploit attackers use to take advantage of the security hole. In general, zero-day refers to two things:
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