A zero-day (also known as 0-day) is a computer-software ... - dofaq.co
zero day (computing)

A zero-day (also known as 0-day) is a computer-software ...

wikipedia - 13 Dec 2021
A zero-day (also known as 0-day) is a computer-software vulnerability either unknown to those who should be interested in its mitigation (including the vendor of the target software) or known and a patch has not been developed. Until the vulnerability is mitigated, hackers can exploit it to adversely affect programs, data, additional computers or a network.[1] An exploit directed at a zero-day is called a zero-day exploit, or zero-day attack.

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