Certificate revocation reason values

A certificate can be revoked for a number of reasons, and those are specified in the CRL as per RFC 5280 Section 5.3.1:

   CRLReason
        unspecified             (0),
        keyCompromise           (1),
        cACompromise            (2),
        affiliationChanged      (3),
        superseded              (4),
        cessationOfOperation    (5),
        certificateHold         (6),
        removeFromCRL           (8),
        privilegeWithdrawn      (9),
        aACompromise            (10)

Value 7 is not used, removeFromCRL is only applicable to delta CRLs and certificateHold is a reversible revocation (can be "unrevoked" at a later stage).
Please note that certificateHold is not an acceptable revocation reason in publicly trusted server certificates, as per CA/B Forum Baseline Requirements.

https://tools.ietf.org/html/rfc5280#section-5.3.1
https://en.wikipedia.org/wiki/Certificate_revocation_list#Reasons_for_revocation
https://cabforum.org/baseline-requirements-documents/

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