What Is A Zero Day Attack? – Fortinet

February 20, 2025

A zero-day attack begins with a hacker discovering a zero-day vulnerability, which is an error in code or software that the target has yet to discover. The attacker then works on a zero-day exploit, a method of attack, that they can use to take advantage of the existing vulnerability.

https://www.fortinet.com/resources/cyberglossary/zero-day-attack

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