alert udp $EXTERNAL_NET any <> $HOME_NET 0 (msg:"GPL POLICY udp port 0 traffic"; reference:bugtraq,576; reference:cve,1999-0675; reference:nessus,10074; classtype:misc-activity; sid:2100525; rev:11; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_20;)