{"cve":"CVE-2021-25740","nvd":{"published":"2021-09-20T17:15:08.283","modified":"2026-06-17T03:42:22.997","status":"Modified","description":"A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","score":3.1},"cwes":["CWE-610","CWE-441"],"references":["https://github.com/kubernetes/kubernetes/issues/103675","https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE","https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/","https://security.netapp.com/advisory/ntap-20211014-0001/","https://github.com/kubernetes/kubernetes/issues/103675"],"products":["kubernetes:kubernetes"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-25740","score":0.01952,"percentile":0.80242,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vw47-mr44-3jf9","url":"https://osv.dev/vulnerability/GHSA-vw47-mr44-3jf9","summary":"Confused Deputy in Kubernetes","modified":"2026-09-10T03:49:08.832153636Z","packages":[{"ecosystem":"Go","name":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","ranges":["<=1.22.2"],"fixed":[]}]}],"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."]}