{ "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": "

\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.

" } ], "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": "

This issue has been fixed in the following versions:

\n" } ], "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" } } ] } }