Tag: Load Balancer

Problems related to load balancers, such as misrouting, unhealthy backends, or configuration faults

ID	Title	Description	Category	Technology	Tags
CRE-2025-0040 Low Impact: 6/10 Mitigation: 4/10	Neutron Open Virtual Network (OVN) fails to bind logical switch due to race condition during load balancer creation	During load balancer creation or other operations involving logical router and logical switch associations, Neutron OVN may raise a `RowNotFound` exception when attempting to reference a logical switch that has just been deleted. This leads to a port binding failure and a rollback of the affected operation.	Networking Problems	neutron	Neutron Ovn Openstack Load Balancer Logical Switch Ovsdb Known Issue Public
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	Nginx Load Balancer Upstream Failure Connectivity
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-problem	nginx	Nginx Reverse Proxy Service Outage High Availability Load Balancer Cascading Failure