CVE-2021-31921: istio/istio: authorization bypass when using AUTO_PASSTHROUGH

Severity: Critical

CVSS Score: 9.8

Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.