CVE-2025-23028
Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. A denial of service vulnerability affects versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4. In a Kubernetes cluster where Cilium is configured to proxy DNS traffic, an attacker can crash Cilium agents by sending a crafted DNS response to workloads from outside the cluster. For traffic that is allowed but without using DNS-based policy, the dataplane will continue to pass traffic as configured at the time of the DoS. For workloads that have DNS-based policy configured, existing connections may continue to operate, and new connections made without relying on DNS resolution may continue to be established, but new connections which rely on DNS resolution may be disrupted. Any configuration changes that affect the impacted agent may not be applied until the agent is able to restart. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. No known workarounds are available.
How to fix
- cilium cilium1.14.18, 1.15.12, 1.16.5 or later
- github.com/cilium/cilium1.14.18, 1.15.12, 1.16.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cilium cilium | 1.14.0 ≤ v < 1.14.18, 1.15.0 ≤ v < 1.15.12, 1.16.0 ≤ v < 1.16.5 | 1.14.18, 1.15.12, 1.16.5 |
| github.com/cilium/ciliumGo | 1.14.0 ≤ v < 1.14.18, 1.15.0 ≤ v < 1.15.12, 1.16.0 ≤ v < 1.16.5 | 1.14.18, 1.15.12, 1.16.5 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.