CVE-2021-25740

{"containers": {"cna": {"affected": [{"product": "Kubernetes", "vendor": "Kubernetes", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "semver"}]}], "credits": [{"lang": "en", "value": "Rob Scott"}], "datePublic": "2021-07-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-441", "description": "CWE-441 Unintended Proxy or Intermediary", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "a6081bf6-c852-4425-ad4f-a67919267565", "shortName": "kubernetes", "dateUpdated": "2026-06-01T21:45:55.645Z"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/"}, {"tags": ["x_refsource_MISC"], "url": "https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/kubernetes/kubernetes/issues/103675"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://security.netapp.com/advisory/ntap-20211014-0001/"}], "source": {"defect": ["https://github.com/kubernetes/kubernetes/issues/103675"], "discovery": "EXTERNAL"}, "title": "Holes in EndpointSlice Validation Enable Host Network Hijack", "x_generator": {"engine": "Vulnogram 0.0.9"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T20:11:27.960Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/kubernetes/kubernetes/issues/103675"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20211014-0001/"}]}]}, "cveMetadata": {"assignerOrgId": "a6081bf6-c852-4425-ad4f-a67919267565", "assignerShortName": "kubernetes", "cveId": "CVE-2021-25740", "datePublished": "2021-09-20T17:05:18.065Z", "dateReserved": "2021-01-21T00:00:00.000Z", "dateUpdated": "2026-06-01T21:45:55.645Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"product": "Kubernetes", "vendor": "Kubernetes", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "jordan@liggitt.net"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:kubernetes:kubernetes:-:*:*:*:*:*:*:*", "matchCriteriaId": "14C32308-314D-4E0D-B15F-6A68DF21E9F9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se ha detectado un problema de seguridad en Kubernetes que podr\u00eda permitir a usuarios enviar tr\u00e1fico de red a lugares a los que de otro modo no tendr\u00edan acceso por medio de un ataque de tipo confused deputy"}], "id": "CVE-2021-25740", "lastModified": "2026-06-17T03:42:22.997", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 3.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:S/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "jordan@liggitt.net", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-09-20T17:15:08.283", "references": [{"source": "jordan@liggitt.net", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://github.com/kubernetes/kubernetes/issues/103675"}, {"source": "jordan@liggitt.net", "tags": ["Mailing List", "Mitigation", "Third Party Advisory"], "url": "https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE"}, {"source": "jordan@liggitt.net", "url": "https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/"}, {"source": "jordan@liggitt.net", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20211014-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://github.com/kubernetes/kubernetes/issues/103675"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Mitigation", "Third Party Advisory"], "url": "https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20211014-0001/"}], "sourceIdentifier": "jordan@liggitt.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-441"}], "source": "jordan@liggitt.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-610"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kubernetes: Endpoint & EndpointSlice permissions allow cross-Namespace forwarding", "id": "1982470", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1982470"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-863", "details": ["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.", "A flaw was found in Kubernetes. This issue enables users to send network traffic to locations they would otherwise not have access to via a confused deputy attack."], "name": "CVE-2021-25740", "package_state": [{"cpe": "cpe:/a:redhat:openshift:3.11", "fix_state": "Out of support scope", "package_name": "atomic-openshift", "product_name": "Red Hat OpenShift Container Platform 3.11"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2021-07-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-25740\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25740\nhttps://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE"], "threat_severity": "Low"}

{}