{"id":"CVE-2021-25735","aliases":["ALPINE-CVE-2021-25735","DEBIAN-CVE-2021-25735","EUVD-2021-1071","GHSA-g42g-737j-qx6j","GO-2022-0907","OESA-2021-1373","RHSA-2021:2437","UBUNTU-CVE-2021-25735","openSUSE-SU-2025:15424-1"],"status":"published","title":"Validating Admission Webhook does not observe some previous fields","description":"A 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.","severity":{"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","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.05375,"percentile":0.92761,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-284","CWE-372","CWE-863"],"published":"2021-05-28T19:49:59Z","modified":"2026-11-03T06:32:38Z","exploits":[{"source":"pocgithub","id":"darryk10/CVE-2021-25735","title":"darryk10/CVE-2021-25735","date":"2021-04-22","url":"https://github.com/darryk10/CVE-2021-25735"}],"fixes":[{"ecosystem":"Go","package":"k8s.io/kubernetes","fixed_in":["1.20.6","1.19.10","1.18.18"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.14","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"k3s","fixed_in":["1.20.6.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"kubernetes","fixed_in":["1.20.5+really1.20.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"kubernetes","fixed_in":["1.20.5+really1.20.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"kubernetes","fixed_in":["1.20.5+really1.20.2-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"k8s.io/kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.20.0"},{"last_affected":"1.20.5"},{"fixed":"1.20.6"}]}]},{"source":"ghsa","ecosystem":"Go","package":"k8s.io/kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.19.0"},{"last_affected":"1.19.9"},{"fixed":"1.19.10"}]}]},{"source":"ghsa","ecosystem":"Go","package":"k8s.io/kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.18.17"},{"fixed":"1.18.18"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"k3s","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.6.1-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.5+really1.20.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.5+really1.20.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"kubernetes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.5+really1.20.2-1"}]}]},{"source":"osv","ecosystem":"Go","package":"k8s.io/kubernetes","ranges":[{"type":"SEMVER","events":[{"introduced":"1.20.0"},{"fixed":"1.20.6"}]}]},{"source":"osv","ecosystem":"Go","package":"k8s.io/kubernetes","ranges":[{"type":"SEMVER","events":[{"introduced":"1.19.0"},{"fixed":"1.19.10"}]}]},{"source":"osv","ecosystem":"Go","p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Admission Webhook does not observe some previous fields","description":"A 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.","status":"published","published":"2021-09-06T11:32:00.853Z","modified":"2024-09-16T23:40:25.902Z","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","assessor":"cna"}],"cwes":["CWE-372"],"updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-1071","description":"A 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.","status":"published","published":"2021-09-06T11:32:00Z","modified":"2024-09-16T23:40:25Z","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":"2026-11-03T00:54:48.177577Z"}],"ghsa":[{"id":"GHSA-g42g-737j-qx6j","title":"Access Restriction Bypass in kube-apiserver","description":"A vulnerability in Kubernetes `kube-apiserver` could allow node updates to bypass a _Validating Admission Webhook_ and allow unauthorized node updates. The information that is provided to the admission controller could contain old configurations that overwrite values used for validation. Since the overwriting takes place before the validation, this could lead the admission controller to accept requests that should be blocked. The vulnerability can be exploited when an update action on node resources is performed and an admission controller is in place and configured to validate the action.\n\nUsers are only affected by this vulnerability if they are running a _Validating Admission Webhook_ for Nodes that denies admission based partially on the old state of the Node object. It only impacts validating admission plugins that rely on old values in certain fields and does not impact calls from kubelets that go through the built-in NodeRestriction admission plugin.","status":"published","published":"2021-05-28T19:49:59Z","modified":"2023-07-31T20:31:50Z","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"}],"cwes":["CWE-284","CWE-372","CWE-863"],"updated_at":"2026-11-02T14:36:58.760727Z"}],"nvd":[{"id":"CVE-2021-25735","description":"A 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.","status":"published","published":"2021-09-06T12:15:07.617Z","modified":"2026-06-17T03:42:22.503Z","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","assessor":"secondary"},{"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","assessor":"primary"},{"version":"2.0","score":5.5,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-372"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"ALPINE-CVE-2021-25735","description":"A 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.","status":"published","published":"2021-09-06T12:15:07.617Z","modified":"2026-11-03T06:32:38.614946726Z","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":"2026-11-03T07:17:20.312441Z"},{"id":"CVE-2021-25735","description":"A 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.","status":"published","published":"2021-09-06T12:15:07.617Z","modified":"2026-10-24T10:51:24.43402204Z","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":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25735","description":"A 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.","status":"published","published":"2021-09-06T12:15:07.617Z","modified":"2026-10-23T18:04:49.580814501Z","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":"2026-11-02T15:45:34.637046Z"},{"id":"GHSA-g42g-737j-qx6j","title":"Access Restriction Bypass in kube-apiserver","description":"A vulnerability in Kubernetes `kube-apiserver` could allow node updates to bypass a _Validating Admission Webhook_ and allow unauthorized node updates. The information that is provided to the admission controller could contain old configurations that overwrite values used for validation. Since the overwriting takes place before the validation, this could lead the admission controller to accept requests that should be blocked. The vulnerability can be exploited when an update action on node resources is performed and an admission controller is in place and configured to validate the action.\n\nUsers are only affected by this vulnerability if they are running a _Validating Admission Webhook_ for Nodes that denies admission based partially on the old state of the Node object. It only impacts validating admission plugins that rely on old values in certain fields and does not impact calls from kubelets that go through the built-in NodeRestriction admission plugin.","status":"published","published":"2021-05-28T19:49:59Z","modified":"2026-09-10T03:49:26.789295488Z","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"}],"cwes":["CWE-284","CWE-372","CWE-863"],"updated_at":"2026-11-02T15:46:47.119724Z"},{"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-2021-25735","description":"A 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.","status":"withdrawn","published":"2021-09-06T12:15:00Z","modified":"2025-07-14T06:45:33.943388Z","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"},{"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":"2026-11-02T15:54:26.779273Z"},{"id":"GO-2022-0907","title":"Access Restriction Bypass in kube-apiserver in k8s.io/kubernetes","description":"Access Restriction Bypass in kube-apiserver in k8s.io/kubernetes","status":"published","published":"2024-08-21T15:29:08Z","modified":"2026-02-04T03:59:40.340851Z","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"}]}}