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) M1"; flow:established,to_server; http.uri; content:"/config/command/"; startswith; fast_pattern; http.content_type; content:"application/json"; nocase; http.request_body; content:"|22|syntax|22 3a|"; content:"|22|type|22 3a|"; content:"|22|RE-SHELL|22 2c|"; within:15; content:"|22|parsing|22 3a|"; content:"|22|outputs|22 3a|"; content:"|22|result|22 3a|"; content:"|7b 22|type|22 3a|"; within:15; content:"|22|str|22 7d|"; within:10; content:"|22|doc|22 3a|"; 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:2067997; 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, 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;)