alert http $EXTERNAL_NET any -> $HOME_NET 8160 (msg:"ET WEB_SPECIFIC_APPS Juniper PTX Series On-Box Anomaly Detection Framwork Command Injection Attempt (CVE-2026-21902) M3"; flow:established,to_server; http.uri; content:"/config/dag-instance/"; startswith; fast_pattern; http.content_type; content:"application/json"; nocase; http.request_body; content:"|22|dag|22 3a|"; content:"|22|enabled|22 3a|"; content:"True|2c|"; within:10; content:"|22|platform|22 3a|"; content:"|22|target|22 3a|"; content:"|22|type|22 3a|"; content:"|22|RE|22|"; within:10; content:"|22|schedule|22 3a|"; content:"|22|start|22 3a|"; content:"|22|delay|22 3a|"; content:"0"; within:5; content:"|22|context|22 3a|"; content:"|7b 7d|"; within:10; reference:url,labs.watchtowr.com/sometimes-you-can-just-feel-the-security-in-the-design-junos-os-evolved-cve-2026-21902-rce/; reference:cve,2026-21902; classtype:attempted-admin; sid:2067999; rev:2; metadata:affected_product JunOS, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_03_03, cve CVE_2026_21902, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_15, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)