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CRL checking (incorrect state input)
Extract from: draft-ietf-pkix-rfc3280bis-01.txt :
« This algorithm assumes that all of the needed CRLs are available in a local cache.
« This algorithm begins by assuming the certificate is not revoked. The algorithm checks one or more CRLs until either the certificate status is determined to be revoked  […] ».

The current text is incorrect :
“If the revocation status remains undetermined, then return the cert_status UNDETERMINED”.

In practice all the needed CRLs may not be in the cache, so the algorithm should start (and finish) with « UNDETERMINED ».
PPT Version