CVE-2023-27594: Cilium vulnerable to potential network policy bypass when routing IPv6 traffic
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, under specific conditions, Cilium may misattribute the source IP address of traffic to a cluster, identifying external traffic as coming from the host on which Cilium is running. As a consequence, network policies for that cluster might be bypassed, depending on the specific network policies enabled.
This issue only manifests when Cilium is routing IPv6 traffic and NodePorts are used to route traffic to pods. IPv6 and endpoint routes are both disabled by default.
The problem has been fixed and is available on versions 1.11.15, 1.12.8, and 1.13.1. As a workaround, disable IPv6 routing.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2023-27594?
CVE-2023-27594 is a vulnerability in Cilium, a networking and security solution, that allows under specific conditions for external traffic to be misattributed as coming from the host on which Cilium is installed.
How does CVE-2023-27594 affect Cilium?
CVE-2023-27594 affects Cilium versions 1.11.15, 1.12.x (up to version 1.12.8), and 1.13.x (up to version 1.13.1).
What is the severity of CVE-2023-27594?
CVE-2023-27594 has a severity rating of 7.3 (high).
How can I fix CVE-2023-27594?
To fix CVE-2023-27594, it is recommended to upgrade Cilium to versions 1.11.15, 1.12.8, or 1.13.1 or later.
What are the references for CVE-2023-27594?
The references for CVE-2023-27594 are: [GitHub - Cilium 1.11.15](https://github.com/cilium/cilium/releases/tag/v1.11.15), [GitHub - Cilium 1.12.8](https://github.com/cilium/cilium/releases/tag/v1.12.8), [GitHub - Cilium 1.13.1](https://github.com/cilium/cilium/releases/tag/v1.13.1).