An attack that takes place before the security community and/or software developers become aware of and fix a security vulnerability is called the 'zero-day attack.'

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A zero-day attack is an attack that exploits a vulnerability that is unknown to the software vendor or the security community. It is called "zero-day" because there are zero days between the time the vulnerability is discovered and the time it is exploited.

An Attack That Takes Place Before the Security Community And/or