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Cisco IOS CEF Packet Information Disclosure (Bug ID CSCdu20643)

Medium

Synopsis

The remote host passes information across the network in an insecure manner.

Description

If the remote device has Cisco Express Forwarding (CEF) enabled, it may leak information from previous packets that have been handled by the device. An attacker may use this vulnerability to sniff your network remotely. This vulnerability is documented as Cisco Bug ID CSCdu20643.

Solution

http://www.cisco.com/warp/public/707/IOS-CEF-pub.shtml