What does the term "zero-day vulnerability" refer to in the context of cybersecurity?

  • A flaw that exists for zero days before being patched
  • A security flaw that is exploited before the software vendor releases a fix
  • A vulnerability that doesn't require any action to mitigate
  • A vulnerability with zero impact on security
In cybersecurity, a "zero-day vulnerability" refers to a security flaw that is exploited before the software vendor releases a fix. It implies that attackers are already exploiting the vulnerability, and there are zero days of protection for users.
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