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CVSS 4.0 calculator

Score CVSS 4.0 vectors with FIRST's reference MacroVector table and get the score, severity band, vector string and the CVSS-B, BT, BE or BTE label.

Enter a vector to score it.

The score comes from FIRST's own reference implementation: the 270-entry MacroVector equivalence table from the CVSS v4.0 specification plus the depth interpolation around it, ported unchanged. Unset values are not neutral: exploit maturity scores as Attacked, requirements grade High, and modified metrics follow their base values. Severity bands are None at 0, Low to 3.9, Medium to 6.9, High to 8.9, Critical above.
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