GEN:SID 1:428
Message ICMP Parameter Problem undefined Code
Summary This event is generated when a host generates and ICMP Parameter Problem datagram with an undefined ICMP Code.
Impact ICMP datagrams should never contain undefined ICMP Codes.  This is normally an indication of nefarious activity occurring on the network.
Detailed Information A router generates a Parameter Problem message for any error not specifically covered by another ICMP message.  This could be an indication of routing problems on the network, or malfunctioning routing hardware.
Affected Systems  
Attack Scenarios None known
Ease of Attack Numerous tools and scripts can generate this type of ICMP datagram.
Corrective Action ICMP Type 12 datagrams with undefined ICMP Codes are not normal network activity.  Hosts generating these types of datagrams should be investigated for configuration errors or nefarious activity.
Additional References None