Discussion
What is a "Zero-Day" exploit ?
Answer: A
The key gives A vulnerability that is not yet discovered.
A zero-day is a flaw that the software's developer does not yet know about, so there has been 'zero days' to fix it and no patch exists. A zero-day exploit is an attack that uses such a flaw. The key's wording means 'not yet discovered' by the vendor; the attacker, of course, has found it.
A patched vulnerability is the opposite case, security software usually cannot stop a zero-day because it has no signature for it, and a software update is the eventual remedy.
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