🛡️Calculators

CVSS 3.1 Score

Calculates CVSS 3.1 Base Score from AV, AC, PR, UI, S, C, I, A metrics.

AV (N=0.85, A=0.62, L=0.55, P=0.2)

AC (L=0.77, H=0.44)

PR (N=0.85, L=0.62, H=0.27)

UI (N=0.85, R=0.62)

C (N=0, L=0.22, H=0.56)

I (N=0, L=0.22, H=0.56)

A (N=0, L=0.22, H=0.56)

resultado

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CVSS base score from raw metric weights

A CVE lands with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H and you need a number to rank the ticket. This page computes the CVSS 3.1 Base Score, with one catch right at the entrance: there is nowhere to paste the vector. You type the numeric weight for each metric, and every field label carries its own lookup table (AV: N=0.85, A=0.62, L=0.55, P=0.2).

Under the hood it builds ISC base as 1 minus (1−C)(1−I)(1−A), multiplies by 6.42 for Impact, computes Exploitability as 8.22 × AV × AC × PR × UI, adds the two and caps the result at 10. That is precisely the Scope Unchanged formula. There is no Scope field, even though the tool description mentions the S metric, and Scope Changed uses a different impact curve plus different PR weights.

Two details shift the final digit. CVSS specifies Roundup to one decimal place, while this page applies ordinary rounding, so AV:N/AC:L/PR:L/UI:N/C:L/I:L/A:N comes out as 5.3 where the official calculator says 5.4. And when C, I and A are all None the standard forces 0.0, while this page returns 3.9, because it still adds exploitability on top of a zero impact. For anything going into a report, verify in the FIRST or NVD calculator. The math runs in your browser.

Frequently asked questions

Can I paste a CVSS vector?

No. All seven fields are numeric and expect the weight of each metric. The label above each field gives the letter-to-number conversion.

Does it cover CVSS 4.0?

No. It implements the 3.1 formula with Scope Unchanged. Version 4.0 changed both the metric set and the scoring logic.

Why does my score match the official one sometimes but not always?

The gap is rounding. When the sum already lands on an exact tenth both agree; when there is a remainder, the official score rounds up and this one does not.

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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.