When a vulnerability exists in software that is, as yet, unknown to the vendor, but known to a hacker, this is referred to as a `____`.

Flashcard 10 - 220-1102 Security Flashcard Set for the CompTIA A+ Core Series Exam

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zero-day attack

Explanation:

Software vendors attempt to release patches as soon as they are discovered to prevent security breaches. Occasionally, hackers will discover these vulnerabilities before the vendor is aware and will attempt to exploit it before a patch is created.

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