{"id":"UBUNTU-CVE-2021-25735","details":"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does not observe some previous fields.","modified":"2025-07-14T06:45:33.943388Z","published":"2021-09-06T12:15:00Z","withdrawn":"2025-08-28T17:00:31Z","upstream":["CVE-2021-25735"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-25735"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2021/04/14/1"},{"type":"REPORT","url":"https://github.com/kubernetes/kubernetes/issues/100096"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-25735"}],"affected":[{"package":{"name":"kubernetes","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/kubernetes@1.0?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0"],"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-25735.json"}},{"package":{"name":"kubernetes","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/kubernetes@1.0?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0"],"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-25735.json"}},{"package":{"name":"kubernetes","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/kubernetes@1.0?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0"],"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-25735.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}