Which of the following best describes a "zero-day" vulnerability?
- A vulnerability known for zero days
- A vulnerability that's been exploited zero times
- A vulnerability that's undisclosed to the vendor
- A vulnerability with no known exploits
A "zero-day" vulnerability is one that's undisclosed to the software or hardware vendor, meaning there are no patches or fixes available. It's called "zero-day" because it's effectively day zero of the vendor's awareness.
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