alert smtp any any -> [$HOME_NET,$SMTP_SERVERS] any (msg:"ET EXPLOIT Zimbra postjournal RCE Attempt Inbound (CVE-2024-45519)"; flow:established,to_server; content:"|0d 0a|RCPT|20|TO|3a 20|"; fast_pattern; content:"|24 28|"; within:200; pcre:"/^RCPT\x20TO\x3a\x20.*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/mi"; reference:cve,2024-45519; classtype:attempted-admin; sid:2056356; rev:3; metadata:affected_product Zimbra, attack_target SMTP_Server, created_at 2024_09_30, cve CVE_2024_45519, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_10_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)