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From, I noticed that the CVSS standard attributes the following impact values ​​for confidentiality, integrity and availability:

0 for none impact,
0.275 for partial impact and
0.66 for complete impact.

My question is the following: what theses scores really represent? Is these values correspond to probability ?

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up vote 1 down vote accepted

No, they do not. They are impact scores.

The page you linked to in your previous question on this details it:

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You can find a very thorough guide to CVSSv2 here There is also the CVSSv2 calculator which links to the equations it uses.

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