application-security
Zero-Day
Zero-Day Vulnerability
Definition
A zero-day is a vulnerability that is unknown to the software vendor or the public and has no available patch. The name refers to the zero days of advance notice defenders have had to prepare.
Zero-days are highly valuable in offensive security and are exploited by nation-state actors and sophisticated criminal groups before discovery. Detection of zero-day exploitation relies on behavioral anomaly detection rather than signature-based approaches.
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