F5 NGINX Critical Vulnerability Active Exploitation | MSSP Advisory

F5 NGINX has a critical vulnerability under active exploitation that affects one-third of all websites worldwide. The bug allows attackers to compromise web servers and applications that rely on NGINX as a reverse proxy or load balancer. Specific technical details of the vulnerability remain limited in current reporting.

Your NGINX instances protecting client web applications and your own MSSP infrastructure are direct targets right now. Clients running web services behind NGINX face immediate compromise risk, and you have a contract obligation to warn them about this active exploitation. Your own monitoring portals, client-facing dashboards, and remote access gateways likely run NGINX in the stack.

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