alert tcp $HOME_NET 2401 -> $EXTERNAL_NET any (msg:"GPL MISC CVS invalid directory response"; flow:from_server,established; content:"E protocol error|3A| invalid directory syntax in"; reference:bugtraq,6650; reference:cve,2003-0015; classtype:misc-attack; sid:2102011; rev:5; metadata:created_at 2010_09_23, cve CVE_2003_0015, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)