Cisco Content Services Gateway Second Generation contains a flaw related to Cisco IOS. This issue may allow a remote attacker to bypass intended access and billing restrictions by sending HTTP traffic to an unresistricted destination, then to a restricted destination.
Upgrade to version 12.4(24)MD3, 12.4(22)MDA5, or 12.4(24)MDA3 or higher, as they have been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.