alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL FTP XCWD overflow attempt"; flow:to_server,established; content:"XCWD"; nocase; isdataat:100,relative; pcre:"/^XCWD\s[^\n]{100}/smi"; reference:bugtraq,11542; reference:bugtraq,8704; classtype:attempted-admin; sid:2102344; rev:4; metadata:created_at 2010_09_23, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)