alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Zoho ManageEngine ServiceDesk Plus Authentication Bypass (CVE-2021-37415)"; flow:established,to_server; http.uri; content:"/app/"; startswith; content:"/api/v3/requests"; fast_pattern; http.header; content:!"authorization|3a 20|"; nocase; reference:url,nvd.nist.gov/vuln/detail/CVE-2021-37415; reference:cve,2021-37415; classtype:web-application-attack; sid:2066201; rev:2; metadata:affected_product Zoho_ManageEngine, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_09, cve CVE_2021_37415, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit, updated_at 2025_12_11, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)