alert http any any -> $HOME_NET 6277 (
msg:"ET WEB_SPECIFIC_APPS Anthropic MCP Inspector Proxy Server-Sent Events (SSE) Unauthenticated Remote Code Execution (CVE-2025-49596)";
flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/sse|3f|";
content:"transportType|3d|stdio"; fast_pattern;
content:"command|3d|";
content:"args|3d|";
reference:url,www.tenable.com/blog/how-tenable-research-discovered-a-critical-remote-code-execution-vulnerability-on-anthropic;
reference:cve,2025-49596;
classtype:web-application-attack;
sid:2063366; rev:1;
metadata:attack_target Server, created_at 2025_07_09, cve CVE_2025_49596, deployment Perimeter, deployment Internal, confidence High, signature_severity Critical, tag Exploit, updated_at 2025_07_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
target:dest_ip;
)