Build a CVSS v3.1 vector interactively and see the base score update live, or paste an existing vector string (for example CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) to decode it into a plain-English explanation of attack vector, complexity, privileges, scope, and confidentiality / integrity / availability impact.
Severity bands
Critical — 9.0–10.0
High — 7.0–8.9
Medium — 4.0–6.9
Low — 0.1–3.9
Frequently asked questions
What CVSS version does the calculator support?
It builds and scores CVSS v3.1 base vectors and decodes any CVSS v3.x vector string into a plain-English breakdown of attack vector, complexity, privileges, scope, and impact.
What are the CVSS severity bands?
Critical is 9.0–10.0, High is 7.0–8.9, Medium is 4.0–6.9, and Low is 0.1–3.9. A score of 0.0 is None.
Can I decode an existing vector string?
Yes. Paste a vector such as CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H to see its base score and a plain-English explanation of each metric.