{
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        "ecosystem": "Go",
        "name": "k8s.io/kubernetes"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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              "fixed": "1.21"
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          ],
          "type": "ECOSYSTEM"
        }
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    }
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  "aliases": [
    "CVE-2021-25736"
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  "database_specific": {
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    "github_reviewed": true,
    "github_reviewed_at": "2023-10-31T22:23:04Z",
    "nvd_published_at": "2023-10-30T03:15:07Z",
    "severity": "MODERATE"
  },
  "details": "Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (`spec.ports[*].port`) as a LoadBalancer Service when the LoadBalancer controller does not set the `status.loadBalancer.ingress[].ip` field. Clusters \nwhere the LoadBalancer controller sets the `status.loadBalancer.ingress[].ip` field are unaffected.\n\n",
  "id": "GHSA-35c7-w35f-xwgh",
  "modified": "2023-10-31T22:23:04Z",
  "published": "2023-10-30T03:30:15Z",
  "references": [
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736"
    },
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      "url": "https://github.com/kubernetes/kubernetes/pull/99958"
    },
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      "url": "https://github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6"
    },
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      "type": "PACKAGE",
      "url": "https://github.com/kubernetes/kubernetes"
    },
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      "url": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ"
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  "schema_version": "1.4.0",
  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kube-proxy may unintentionally forward traffic"
}

{
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            "value": "Kube-proxy en Windows puede reenviar tr\u00e1fico involuntariamente a procesos locales que escuchan en el mismo puerto (\u201cspec.ports[*].port\u201d) que LoadBalancer Service cuando el controlador LoadBalancer no configura \u201cstatus.loadBalancer.ingress[].ip\u201d. Los cl\u00fasteres donde el controlador LoadBalancer establece el campo \"status.loadBalancer.ingress[].ip\" no se ven afectados."
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        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "discovery_date": "2021-04-06T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1946538"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Windows kube-proxy component. In a cloud environment that does not set the \u201c.status.loadBalancer.ingress.ip\u201d field in the LoadBalancer service status configuration (for example in AWS) the packets can be misrouted and reach an unintended destination.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kubernetes: LoadBalancer Service type don\u0027t create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Clusters where the LoadBalancer controller sets the \u201cstatus.loadBalancer.ingress[].ip\u201d field are unaffected.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
          "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "RHBZ#1946538",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1946538"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-25736",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q",
          "url": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q"
        }
      ],
      "release_date": "2021-05-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-06-23T05:37:46+00:00",
          "details": "For Windows Machine Config Operator upgrades, see the following documentation:\n\nhttps://docs.openshift.com/container-platform/4.7/windows_containers/windows-node-upgrades.html",
          "product_ids": [
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2130"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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"
          },
          "products": [
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kubernetes: LoadBalancer Service type don\u0027t create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM"
    }
  ]
}