Files
vuln-cve/data/2021/25xxx/CVE-2021-25736.json
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{
"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"
}
}
]
}
}