Rule History

alert smtp any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (msg:"ET EXPLOIT Exim Stack Exhaustion via BDAT Error Inbound (CVE-2020-28019)"; flow:established,to_server; content:"BDAT|20|"; pcre:"/^[^\r\n]{50,}/R"; content:"BDAT|20|"; distance:0; fast_pattern; reference:url,www.qualys.com/2021/05/04/21nails/21nails.txt; reference:cve,2020-28019; classtype:attempted-admin; sid:2032903; rev:1; metadata:attack_target SMTP_Server, created_at 2021_05_04, cve CVE_2020_28019, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_04;)