CVE-2010-4685
Cisco IOS before 15.0(1)XA1 does not clear the public key cache upon a change to a certificate map, which allows remote authenticated users to bypass a certificate ban by connecting with a banned certificate that had previously been valid, aka Bug ID CSCta79031.
Date published : 2011-01-07
http://www.securityfocus.com/bid/45769
http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf