alert udp $EXTERNAL_NET any -> $HOME_NET 69 (msg:"GPL TFTP root directory"; content:"|00 01|/"; depth:3; reference:cve,1999-0183; classtype:bad-unknown; sid:2100520; rev:6; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)