{"id":"GHSA-8fg8-jh2h-f2hc","summary":"Potential network policy bypass when routing IPv6 traffic ","details":"## Impact\n\nUnder 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. Only IPv6 traffic is impacted by this vulnerability.\n\nThis issue only manifests when:\n* Cilium is routing IPv6 traffic, and\n* Kube-proxy is used for service handling, and\n* NodePorts are used to route traffic to pods.\n\nIPv6 is disabled by default. Cilium's kube-proxy replacement feature is not affected by this vulnerability.\n\n## Patches\n\nThe problem has been fixed and is available on versions \u003e=1.11.15, \u003e=1.12.8, \u003e=1.13.1\n\n## Workarounds\n\nDisable IPv6 routing (IPv6 is disabled by default).\n\n## Acknowledgements\n\nThe Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to Yusuke Suzuki for both highlighting and fixing the issue.\n\n## For more information\n\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).\n\nAs usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: security@cilium.io - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.","aliases":["BIT-cilium-2023-27594","BIT-cilium-operator-2023-27594","BIT-cilium-proxy-2023-27594","BIT-hubble-2023-27594","BIT-hubble-relay-2023-27594","BIT-hubble-ui-2023-27594","BIT-hubble-ui-backend-2023-27594","CVE-2023-27594","GO-2023-1643"],"modified":"2026-09-10T03:49:52.887909600Z","published":"2023-03-17T18:22:19Z","database_specific":{"nvd_published_at":"2023-03-17T20:15:00Z","cwe_ids":["CWE-285","CWE-863"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2023-03-17T18:22:19Z"},"references":[{"type":"WEB","url":"https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27594"},{"type":"PACKAGE","url":"https://github.com/cilium/cilium"},{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.11.15"},{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.12.8"},{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.13.1"}],"affected":[{"package":{"name":"github.com/cilium/cilium","ecosystem":"Go","purl":"pkg:golang/github.com/cilium/cilium"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.11.15"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-8fg8-jh2h-f2hc/GHSA-8fg8-jh2h-f2hc.json"}},{"package":{"name":"github.com/cilium/cilium","ecosystem":"Go","purl":"pkg:golang/github.com/cilium/cilium"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.12.0"},{"fixed":"1.12.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-8fg8-jh2h-f2hc/GHSA-8fg8-jh2h-f2hc.json"}},{"package":{"name":"github.com/cilium/cilium","ecosystem":"Go","purl":"pkg:golang/github.com/cilium/cilium"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.13.0"},{"fixed":"1.13.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-8fg8-jh2h-f2hc/GHSA-8fg8-jh2h-f2hc.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}