{"cve":"CVE-2023-41333","nvd":{"published":"2023-09-27T15:19:30.163","modified":"2026-06-17T06:21:50.350","status":"Modified","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H","score":8.1},"cwes":["CWE-306"],"references":["https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker","https://github.com/cilium/cilium/pull/28007","https://github.com/cilium/cilium/security/advisories/GHSA-4xp2-w642-7mcx","https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker","https://github.com/cilium/cilium/pull/28007"],"products":["cilium:cilium"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-41333","score":0.00482,"percentile":0.41595,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4xp2-w642-7mcx","url":"https://osv.dev/vulnerability/GHSA-4xp2-w642-7mcx","summary":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy ","modified":"2026-09-10T03:49:57.766721289Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.14.0 <1.14.2"],"fixed":["1.14.2"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.13.0 <1.13.7"],"fixed":["1.13.7"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.12.14"],"fixed":["1.12.14"]}]},{"id":"GO-2023-2080","url":"https://osv.dev/vulnerability/GO-2023-2080","summary":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy in github.com/cilium/cilium","modified":"2026-02-04T02:16:04.157526Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.12.14",">=1.13.0 <1.13.7",">=1.14.0 <1.14.2"],"fixed":["1.12.14","1.13.7","1.14.2"]}]}],"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."]}