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CVSS v3.1 Calculator

Calculate a CVSS v3.1 base score and vector string by choosing the eight base metrics. Results match the official FIRST specification and update instantly.

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CVSS calculatorVulnerability
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100% privateRuns in your browser, nothing uploaded
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Instant resultsNo sign-up, no install
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CVSS calculator

🔒 Runs locally in your browser. Nothing you enter is uploaded.

How to use it

  1. Choose Attack Vector, Complexity, Privileges, User Interaction and Scope.
  2. Set the Confidentiality, Integrity and Availability impact.
  3. Copy the score and vector into your report.

Frequently asked questions

What do CVSS scores mean?

0.1–3.9 Low, 4.0–6.9 Medium, 7.0–8.9 High, 9.0–10.0 Critical.

Should I patch by CVSS alone?

No. Combine CVSS with evidence of exploitation (CISA KEV, EPSS) and how exposed the asset is.

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