N-day vulnerability
Also called: N-day
A vulnerability first exploited after the vendor has released a patch. Attackers can compare patched and unpatched code to find the flaw and build an exploit quickly, so the window between a patch release and your update is the dangerous part. Update internet-facing services and edge devices first.
Further reading: cloud.google.com
From the Security Academy
Zero-Day and N-Day Vulnerabilities: Why Flaws That Already Have a Patch Are Exploited Most
A zero-day is exploited before a patch exists; an n-day after the patch ships but before you apply it. The timing gap, and what to do when no patch exists.
7 min read ·
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