{"cve":"CVE-2021-25737","nvd":{"published":"2021-09-06T12:15:07.673","modified":"2026-06-17T03:42:22.750","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","score":4.8},"cwes":["CWE-601","CWE-184"],"references":["https://github.com/kubernetes/kubernetes/issues/102106","https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY","https://security.netapp.com/advisory/ntap-20211004-0004/","https://github.com/kubernetes/kubernetes/issues/102106","https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY"],"products":["kubernetes:kubernetes"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-25737","score":0.01326,"percentile":0.70976,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-mfv7-gq43-w965","url":"https://osv.dev/vulnerability/GHSA-mfv7-gq43-w965","summary":"Incomplete List of Disallowed Inputs in Kubernetes","modified":"2024-08-21T15:58:33.183449Z","packages":[{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":[">=1.16.0 <1.18.19"],"fixed":["1.18.19"]},{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":[">=1.19.0 <1.19.11"],"fixed":["1.19.11"]},{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":[">=1.20.0 <1.20.7"],"fixed":["1.20.7"]},{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":[">=1.21.0 <1.21.1"],"fixed":["1.21.1"]}]},{"id":"GO-2022-0908","url":"https://osv.dev/vulnerability/GO-2022-0908","summary":"Incomplete List of Disallowed Inputs in Kubernetes in k8s.io/kubernetes","modified":"2026-03-03T04:52:29.420727Z","packages":[{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":[">=1.16.0 <1.18.19",">=1.19.0 <1.19.11",">=1.20.0 <1.20.7",">=1.21.0 <1.21.1"],"fixed":["1.18.19","1.19.11","1.20.7","1.21.1"]}]}],"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."]}