ET WEB_SPECIFIC_APPS Zoho ManageEngine ServiceDesk Plus Custom Schedules Arbitrary Command Execution (CVE-2021-20081)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Zoho ManageEngine ServiceDesk Plus Custom Schedules Arbitrary Command Execution (CVE-2021-20081)";
    flow:established,to_server;
    http.uri;
    content:"/api/v3/custom_schedules"; fast_pattern;
    http.request_body;
    content:"executor_type";
    content:"script"; within:20;
    reference:url,www.tenable.com/security/research/tra-2021-22;
    reference:cve,2021-20081;
    classtype:web-application-attack;
    sid:2066202; rev:1;
    metadata:affected_product Zoho_ManageEngine, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_09, cve CVE_2021_20081, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_12_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)