alert tcp $EXTERNAL_NET any -> $HOME_NET 110 (msg:"GPL POP3 UIDL negative argument attempt"; flow:established,to_server; content:"UIDL"; nocase; pcre:"/^UIDL\s+-\d/smi"; reference:bugtraq,6053; reference:cve,2002-1539; reference:nessus,11570; classtype:misc-attack; sid:2102122; rev:12; metadata:created_at 2010_09_23, signature_severity Unknown, updated_at 2024_03_08;)