CVE-2025-30162: Cilium East-west traffic not subject to egress policy enforcement for requests via Gateway API load balancers

March 24, 2025

For Cilium users who:

Use Gateway API for Ingress for some services AND
Use LB-IPAM or BGP for LB Service implementation AND
Use network policies to block egress traffic from workloads in a namespace to workloads in other namespaces

Egress traffic from workloads covered by such network policies to LoadBalancers configured by Gateway resources will incorrectly be allowed.

LoadBalancer resources not deployed via a Gateway API configuration are not affected by this issue.

References

docs.cilium.io/en/stable/network/lb-ipam
github.com/advisories/GHSA-24qp-4xx8-3jvj
github.com/cilium/cilium
github.com/cilium/cilium/security/advisories/GHSA-24qp-4xx8-3jvj
github.com/cilium/proxy/pull/1172
nvd.nist.gov/vuln/detail/CVE-2025-30162

Code Behaviors & Features

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