Calculate CVSS score from CVSS vector

[Hritik14]

We should have a way to calculate CVSS score from the given CVSS vector in our ScoringSystem. The calculated score should also be saved in the database. For now we can have the CVSS base scores.

See: https://www.first.org/cvss/calculator/3.0

(via: https://github.com/nexB/vulnerablecode/wiki/WeeklyMeetings#meeting-on-tuesday-2022-04-26-at-1000-utc)

[DennisClark]

this post from NIST might be interesting to those following this issue:
https://csrc.nist.gov/publications/detail/nistir/8409/final