alert udp $EXTERNAL_NET any -> $HOME_NET 161 (msg:"ET SNMP missing community string attempt 1"; content:"|30|"; depth:1; byte_test:1,!&,0x80,0,relative,big; content:"|02|"; distance:1; within:1; byte_test:1,!&,0x80,0,relative,big; byte_jump:1,0,relative; content:"|04 00|"; within:2; reference:bugtraq,2112; reference:cve,1999-0517; classtype:misc-attack; sid:2016178; rev:2; metadata:created_at 2013_01_09, cve CVE_1999_0517, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)