A zero-day vulnerability is a security flaw that is unknown to the software vendor and has no available patch. The term 'zero-day' refers to the fact that developers have had zero days to fix the issue. Zero-day vulnerabilities are particularly dangerous because there is no defense other than mitigating controls until a patch is released.
Zero-days represent the highest-risk class of vulnerabilities because they can be exploited before anyone — including the vendor — knows they exist. They are frequently used in targeted attacks against high-value organizations.
While no scanner can guarantee zero-day detection, Redsight's adaptive agent goes beyond known CVE checks. It tests for misconfigurations, logic flaws, and novel attack paths that traditional scanners miss.
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