{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-25736","assignerOrgId":"a6081bf6-c852-4425-ad4f-a67919267565","state":"PUBLISHED","assignerShortName":"kubernetes","dateReserved":"2021-01-21T21:42:58.237Z","datePublished":"2023-10-30T02:19:48.916Z","dateUpdated":"2025-06-12T14:42:12.231Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","modules":["Kube-Proxy"],"platforms":["Windows"],"product":"Kubernetes","repo":"https://github.com/kubernetes/kubernetes","vendor":"Kubernetes","versions":[{"lessThanOrEqual":"v1.20.5","status":"affected","version":"0","versionType":"v1.20.5"}]}],"credits":[{"lang":"en","type":"finder","user":"00000000-0000-4000-9000-000000000000","value":"Eric Paris"},{"lang":"en","type":"finder","user":"00000000-0000-4000-9000-000000000000","value":"Christian Hernandez"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>\nKube-proxy\n on Windows can unintentionally forward traffic to local processes \nlistening on the same port (“spec.ports[*].port”) as a LoadBalancer \nService when the LoadBalancer controller\n does not set the “status.loadBalancer.ingress[].ip” field. Clusters \nwhere the LoadBalancer controller sets the \n“status.loadBalancer.ingress[].ip” field are unaffected.<u></u><u></u></p>"}],"value":"Kube-proxy\n on Windows can unintentionally forward traffic to local processes \nlistening on the same port (“spec.ports[*].port”) as a LoadBalancer \nService when the LoadBalancer controller\n does not set the “status.loadBalancer.ingress[].ip” field. Clusters \nwhere the LoadBalancer controller sets the \n“status.loadBalancer.ingress[].ip” field are unaffected."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"providerMetadata":{"orgId":"a6081bf6-c852-4425-ad4f-a67919267565","shortName":"kubernetes","dateUpdated":"2023-12-21T22:06:17.289Z"},"references":[{"url":"https://github.com/kubernetes/kubernetes/pull/99958"},{"url":"https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ"},{"url":"https://security.netapp.com/advisory/ntap-20231221-0003/"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>This issue has been fixed in the following versions:<u></u><u></u></p>\n<ul>\n<li>\nv1.21.0<u></u><u></u></li><li>\nv1.20.6<u></u><u></u></li><li>\nv1.19.10<u></u><u></u></li><li>\nv1.18.18</li></ul>"}],"value":"This issue has been fixed in the following versions:\n\n\n\n  *  \nv1.21.0\n  *  \nv1.20.6\n  *  \nv1.19.10\n  *  \nv1.18.18"}],"source":{"discovery":"UNKNOWN"},"title":"Windows kube-proxy LoadBalancer contention","x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T20:11:28.044Z"},"title":"CVE Program Container","references":[{"url":"https://github.com/kubernetes/kubernetes/pull/99958","tags":["x_transferred"]},{"url":"https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ","tags":["x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20231221-0003/","tags":["x_transferred"]}]},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-114","lang":"en","description":"CWE-114 Process Control"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-06-12T14:39:48.612391Z","id":"CVE-2021-25736","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-06-12T14:42:12.231Z"}}]}}