{"id":"CVE-2021-25737","aliases":["DEBIAN-CVE-2021-25737","EUVD-2021-2095","GHSA-mfv7-gq43-w965","GO-2022-0908","OESA-2021-1373","RHSA-2021:2437","UBUNTU-CVE-2021-25737","openSUSE-SU-2025:15424-1"],"status":"published","title":"Holes in EndpointSlice Validation Enable Host Network Hijack","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. 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Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"published","published":"2021-09-07T23:09:24Z","modified":"2023-02-01T05:06:25Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-184","CWE-601"],"updated_at":"2026-11-02T14:36:39.086869Z"}],"nvd":[{"id":"CVE-2021-25737","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"published","published":"2021-09-06T12:15:07.673Z","modified":"2026-06-17T03:42:22.75Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.9,"vector":"AV:N/AC:M/Au:S/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-184","CWE-601"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"CVE-2021-25737","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"published","published":"2021-09-06T12:15:07.673Z","modified":"2026-10-24T10:47:53.967500356Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25737","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"published","published":"2021-09-06T12:15:07.673Z","modified":"2026-10-23T18:02:41.072135346Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"GHSA-mfv7-gq43-w965","title":"Incomplete List of Disallowed Inputs in Kubernetes","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"published","published":"2021-09-07T23:09:24Z","modified":"2024-08-21T15:58:33.183449Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-184","CWE-601"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"OESA-2021-1373","title":"kubernetes security update","description":"Container cluster management.\r\n\r\nSecurity Fix(es):\r\n\r\nA security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.(CVE-2021-25737)\r\n\r\nA security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.(CVE-2021-25735)","status":"published","published":"2021-09-30T11:04:38Z","modified":"2026-08-18T01:16:03.437431497Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:2437","title":"Red Hat Security Advisory: OpenShift Container Platform 4.8.2 packages and security update","status":"published","published":"2024-09-18T04:18:53Z","modified":"2026-10-09T10:02:33Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"UBUNTU-CVE-2021-25737","description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","status":"withdrawn","published":"2021-09-06T12:15:00Z","modified":"2025-07-14T06:45:34.006156Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"GO-2022-0908","title":"Incomplete List of Disallowed Inputs in Kubernetes in k8s.io/kubernetes","description":"Incomplete List of Disallowed Inputs in Kubernetes in k8s.io/kubernetes","status":"published","published":"2024-08-21T15:29:08Z","modified":"2026-03-03T04:52:29.420727Z","updated_at":"2026-11-02T15:47:00.918515Z"},{"id":"openSUSE-SU-2025:15424-1","title":"govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media","description":"These are all security issues fixed in the govulncheck-vulndb-0.0.20250807T150727-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-08-08T00:00:00Z","modified":"2026-03-23T04:53:45.821911Z","updated_at":"2026-11-02T16:58:37.810934Z"}]}}