alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP NextFTP client overflow"; flow:to_client,established; content:"|B4| |B4|!|8B CC 83 E9 04 8B 19|3|C9|f|B9 10|"; fast_pattern:only; reference:bugtraq,572; reference:cve,1999-0671; classtype:attempted-user; sid:2100308; rev:11; metadata:created_at 2010_09_23, confidence Medium, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)