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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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25737.json","reference_id":"","reference_type":"","scores":[{"value":"2.7","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25737.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25737","reference_id":"","reference_type":"","scores":[{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59421","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59401","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59426","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59444","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59438","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59406","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59424","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59441","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59422","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59293","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59408","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59357","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59391","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00379","scoring_system":"epss","scoring_elements":"0.59367","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25737"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25737","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25737"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"2.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/kubernetes/kubernetes","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes"},{"reference_url":"https://github.com/kubernetes/kubernetes/issues/102106","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes/issues/102106"},{"reference_url":"https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25737","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25737"},{"reference_url":"https://security.netapp.com/advisory/ntap-20211004-0004","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20211004-0004"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1954917","reference_id":"1954917","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1954917"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990793","reference_id":"990793","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990793"},{"reference_url":"https://security.archlinux.org/ASA-202106-29","reference_id":"ASA-202106-29","reference_type":"","scores":[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Restriction Bypass in kube-apiserver\nA 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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25735.json","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25735.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25735","reference_id":"","reference_type":"","scores":[{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94444","published_at":"2026-04-26T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94446","published_at":"2026-04-24T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94443","published_at":"2026-04-29T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94437","published_at":"2026-04-16T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94422","published_at":"2026-04-13T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.9442","published_at":"2026-04-11T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94418","published_at":"2026-04-09T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94414","published_at":"2026-04-08T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94384","published_at":"2026-04-01T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94405","published_at":"2026-04-07T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94403","published_at":"2026-04-04T12:55:00Z"},{"value":"0.14393","scoring_system":"epss","scoring_elements":"0.94391","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25735"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1937562","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1937562"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25735","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25735"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/kubernetes/kubernetes","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes"},{"reference_url":"https://github.com/kubernetes/kubernetes/commit/00e81db174ef7aca497be5f42d87e46d14df2a90","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes/commit/00e81db174ef7aca497be5f42d87e46d14df2a90"},{"reference_url":"https://github.com/kubernetes/kubernetes/issues/100096","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes/issues/100096"},{"reference_url":"https://github.com/kubernetes/kubernetes/pull/99946","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/kubernetes/kubernetes/pull/99946"},{"reference_url":"https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25735","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_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