alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"GPL IMAP fetch overflow attempt"; flow:established,to_server; content:"FETCH"; nocase; isdataat:500,relative; pcre:"/\sFETCH\s[^\n]{500}/smi"; reference:bugtraq,11775; classtype:misc-attack; sid:2103070; rev:3; metadata:created_at 2010_09_23, confidence Medium, signature_severity Major, updated_at 2019_07_26;)