Tag: Envoy Upstream Errors
Failures occurring when a proxy or gateway cannot get a valid response from a backend or upstream service.
| ID | Title | Description | Category | Technology | Tags |
|---|---|---|---|---|---|
| CRE-2025-0118 High Impact: 7/10 Mitigation: 7/10 | Envoy proxy unable to connect to upstream services | This rule detects when Envoy proxy is experiencing consistent failures connecting to upstream services, resulting in HTTP 503 (Service Unavailable) or 504 (Gateway Timeout) errors. These errors are typically accompanied by \"UH\" (upstream service unhealthy) or \"UT\" (upstream request timeout) response flags in Envoy access logs, indicating backend service connectivity issues that require immediate attention. | Envoy Upstream Failures | envoy | Envoy ProxyLoad BalancerEnvoy Upstream ErrorsEnvoy Service UnavailableEnvoy Gateway Timeout |