CVE-2025-30162
Cilium East-west traffic not subject to egress policy enforcement for requests via Gateway API load balancers
Impact
### Impact For Cilium users who: - Use Gateway API for Ingress for some services **AND** - Use [LB-IPAM](https://docs.cilium.io/en/stable/network/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. ### Patches This issue was fixed by https://github.com/cilium/proxy/pull/1172. This issue affects: - Cilium v1.15 between v1.15.0 and v1.15.14 inclusive - Cilium v1.16 between v1.16.0 and v1.16.7 inclusive - Cilium v1.17 between v1.17.0 and v1.17.1 inclusive This issue is fixed in: - Cilium v1.15.15 - Cilium v1.16.8 - Cilium v1.17.2 ### Workarounds A Clusterwide Cilium Network Policy can be used to work around this issue for users who are unable to upgrade. An outline of such a policy is provided below: ``` apiVersion: "cilium.io/v2" kind: CiliumClusterwideNetworkPolicy metadata: name: "workaround" spec: endpointSelector: matchExpressions: - key: reserved:ingress operator: Exists ingress: - fromEntities: - world ``` - The policy opens up connectivity from all locations outside the cluster into the Cilium Ingress Gateway. - The policy establishes a default deny for all other traffic towards the Cilium Ingress Gateway, including all in-cluster sources. - It is possible to tailor the policy to more narrowly allow inbound traffic while creating a default deny posture for traffic between namespaces. Users should edit the policy to bring it in line with the security requirements particular to their environments. ### Acknowledgements The Cilium community has worked together with members of the Isovalent team to prepare these mitigations. Special thanks to @jrajahalme for the fix. ### For more information If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [security@cilium.io](mailto:security@cilium.io). This is a private mailing list for the Cilium security team, and your report will be treated as top priority.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/cilium/cilium | >= 1.16.0, < 1.16.8 | 1.16.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cilium | Cilium | from 1.15.0 before 1.15.15 from 1.16.0 before 1.16.8 from 1.17.0 before 1.17.2 |