Certificate Server 7.2 in Red Hat Certificate System (RHCS) does not properly handle new revocations that occur while a Certificate Revocation List (CRL) is being generated, which might prevent certain revoked certificates from appearing on the CRL quickly and allow users with revoked certificates to bypass the intended CRL.
https://rhn.redhat.com/errata/RHSA-2008-0566.html
http://www.vupen.com/english/advisories/2007/3406
http://www.vupen.com/english/advisories/2007/3405
http://www.securitytracker.com/id?1020532
http://www.securityfocus.com/bid/26377
http://www.redhat.com/support/errata/RHSA-2007-0934.html