zero-day
A zero-day is a software vulnerability found or exploited before a security patch is available, or an attack using it.
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Last mentioned A zero-day is a software vulnerability discovered or exploitable before a security patch is available; the term can also refer to an attack that uses it. It differs from a vulnerability that remains exposed because an existing patch has not been installed.
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…Palo Alto Networks research team reported finding 14,000 vulnerabilities through automated analysis, with 99% described as previously unreported zero-day flaws.