CVE-2023-27594

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.

• CWE-285
• CWE-863

• https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
• https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
• https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
• https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hcThird Party Advisory
• https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
• https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
• https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
• https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hcThird Party Advisory

Published

Mar 17, 2023

Last Modified

Jun 17, 2026

Status

Modified

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