CVSS Base Vector Decoder
Decodes a CVSS base vector string and estimates the numerical score from average weight.
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What this decoder actually computes
The name says vector string decoder, so it is fair to arrive expecting a text box for CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. There is none. What you get instead is five numeric inputs: four for the exploitability metrics on a small ordinal scale of the page's own making, plus one field where Confidentiality, Integrity and Availability collapse into a single total from 0 to 12.
The arithmetic is a house index, not CVSS. It averages AV, AC, PR and UI over 16, takes the C+I+A total over 12, blends the two halves evenly and scales to 10. The output stays between 0 and 10 and rises with severity, but it reproduces neither the 8.22 and 6.42 coefficients nor the multiplicative structure of the standard. Matching an NVD score is coincidence rather than design.
Treat it as rough triage when you only need to rank a handful of findings against each other, or as a teaching aid for seeing which metrics push severity up. Anything that ends up in a report, a remediation ticket or a patching SLA should come from the CVSS 3.1 calculator on this site or from the official FIRST calculator, with real metric weights. Everything is computed locally in the browser.
Frequently asked questions
So it decodes nothing?
How do I fill the C+I+A field?
Does the number match the official CVSS score?
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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.