{"cve":"CVE-2023-27594","nvd":{"published":"2023-03-17T20:15:13.583","modified":"2026-06-17T05:45:32.733","status":"Modified","description":"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.\n\nThis 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.\n\nThe 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","score":7.3},"cwes":["CWE-863","CWE-285"],"references":["https://github.com/cilium/cilium/releases/tag/v1.11.15","https://github.com/cilium/cilium/releases/tag/v1.12.8","https://github.com/cilium/cilium/releases/tag/v1.13.1","https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc","https://github.com/cilium/cilium/releases/tag/v1.11.15"],"products":["cilium:cilium"],"source":"nvd","synced_at":"2026-10-19T21:37:48.383111019+00:00"},"epss":{"cve":"CVE-2023-27594","score":0.00552,"percentile":0.46176,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8fg8-jh2h-f2hc","url":"https://osv.dev/vulnerability/GHSA-8fg8-jh2h-f2hc","summary":"Potential network policy bypass when routing IPv6 traffic ","modified":"2026-09-10T03:49:52.887909600Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.11.15"],"fixed":["1.11.15"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.12.0 <1.12.8"],"fixed":["1.12.8"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.13.0 <1.13.1"],"fixed":["1.13.1"]}]},{"id":"GO-2023-1643","url":"https://osv.dev/vulnerability/GO-2023-1643","summary":"Potential network policy bypass when routing IPv6 traffic in github.com/cilium/cilium","modified":"2026-02-04T04:00:35.112339Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.11.15",">=1.12.0 <1.12.8",">=1.13.0 <1.13.1"],"fixed":["1.11.15","1.12.8","1.13.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}