ET EXPLOIT Possible Linksys E1500/E2500 apply.cgi RCE Attempt

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Possible Linksys E1500/E2500 apply.cgi RCE Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/apply.cgi"; depth:10;
    http.request_body;
    content:"submit_button="; depth:14;
    content:"&submit_type=start_ping"; distance:0; fast_pattern;
    content:"&ping_size="; distance:0;
    content:"|3b|"; within:30;
    reference:url,www.exploit-db.com/exploits/24936;
    classtype:attempted-user;
    sid:2027099; rev:3;
    metadata:attack_target IoT, created_at 2019_03_19, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_11_18;
)