Category: Load Balancer Problems
Problems related to load balancers
| ID | Title | Description | Category | Technology | Tags |
|---|---|---|---|---|---|
| CRE-2025-0051 High Impact: 9/10 Mitigation: 5/10 | NGINX No Live Upstreams Available | NGINX is reporting that all backend servers in an upstream group are unavailable. This means that NGINX cannot route requests to any of its configured backend servers, resulting in client-facing errors. | Load Balancer Problems | nginx | NginxLoad BalancerUpstream FailureConnectivity |
| CRE-2025-0075 Critical Impact: 10/10 Mitigation: 6/10 | Nginx Upstream Failure Cascade Crisis | Detects critical Nginx upstream failure cascades that lead to complete service unavailability. This advanced rule identifies comprehensive upstream failure patterns including DNS resolution failures, connection timeouts, SSL/TLS handshake errors, protocol violations, and server unavailability, followed by HTTP 5xx error responses within a 60-second window. The rule uses optimized regex patterns for maximum detection coverage while maintaining high performance and low false-positive rates. It captures both the root cause (upstream failures) and the user-facing impact (HTTP errors) to provide complete incident context. | Load Balancer Problems | nginx | NginxReverse ProxyService OutageHigh AvailabilityLoad BalancerCascading Failure |
| CRE-2025-0114 High Impact: 0/10 Mitigation: 0/10 | Nginx Ingress Controller rewritten URI has a zero length | Detects rewrite error which leads to service unavailability. Wrong rewrite causes responses with HTTP code 500 or 400. This CRE detects empty rewrite. | Load Balancer Problems | nginx | NginxReverse ProxyService OutageIngress ControllerNGINX IngressLoad BalancerKubernetes |
| CRE-2025-0121 Critical Impact: 10/10 Mitigation: 7/10 | NGINX Ingress Controller SSL Certificate Failure | Critical NGINX Ingress Controller SSL certificate validation failure detected. This pattern indicates cascading SSL failures where certificate verification errors lead to upstream connection failures and service unavailability. The failure sequence shows SSL handshake failures, certificate verification errors, and resulting HTTP error responses that affect client connectivity. | Load Balancer Problems | nginx | NginxIngress ControllerSSL CertificateTLS HandshakeCertificate VerificationLoad BalancerKubernetesSecurityHigh AvailabilityService Unavailability |