ET WEB_SPECIFIC_APPS Fortigate FortiOS Invalid HTTP Chunk Length (CVE-2024-21762) Vulnerability Scan Attempt

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Fortigate FortiOS Invalid HTTP Chunk Length (CVE-2024-21762) Vulnerability Scan Attempt";
    flow:established,to_server;
    content:"|0d 0a 0d 0a|0000000000000000FF|0d 0a 0d 0a|"; fast_pattern;
    http.method;
    content:"POST";
    http.uri;
    content:"/remote/";
    http.header;
    content:"Transfer-Encoding|3a 20|chunked";
    reference:url,github.com/BishopFox/cve-2024-21762-check;
    reference:cve,2024-21762;
    classtype:trojan-activity;
    sid:2051765; rev:1;
    metadata:affected_product Fortigate, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2024_03_22, cve CVE_2024_21762, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2024_03_22, reviewed_at 2024_10_03;
    target:dest_ip;
)