{"schema_version":"1.8.0","id":"CVE-2021-25736","published":"2023-10-30T03:15:07.653Z","modified":"2026-08-07T16:57:17.918977Z","aliases":["GHSA-35c7-w35f-xwgh","GO-2023-2159"],"related":["CGA-g7x6-8ch3-6hqw","openSUSE-SU-2025:15424-1"],"details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/kubernetes/kubelet","events":[{"introduced":"f0d06ae44a2e7ef0c05aecb6e7773222947dd156"},{"fixed":"91407aecd4edbe8888bb4648ee46e8dae792a20d"},{"introduced":"1af8853567a0faecc59fbc4d7d2ddc9359ddde83"},{"fixed":"ea1348bf4a58d089e74ac7def7f855945a2c0bbb"},{"introduced":"30b4cd52c54df86ed93459ba84b3e61877fc28ea"},{"fixed":"723e5d932a5277a14f5c636330ac445539bf5708"}],"database_specific":{"cpe":"cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.18.0"},{"fixed":"1.18.18"},{"introduced":"1.19.0"},{"fixed":"1.19.10"},{"introduced":"1.20.0"},{"fixed":"1.20.6"}],"source":"CPE_RANGE"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25736.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/kubernetes/kubernetes","events":[{"introduced":"9e991415386e4cf155a24b1da15becaa390438d8"},{"fixed":"6f6ce59dc8fefde25a3ba0ef0047f4ec6662ef24"},{"introduced":"e19964183377d0ec2052d1f1fa930c4d7575bd50"},{"fixed":"98d5dc5d36d34a7ee13368a7893dcb400ec4e566"},{"introduced":"af46c47ce925f4c4ad5cc8d1fca46c7b77d13b38"},{"fixed":"8a62859e515889f07e3e3be6a1080413f17cf2c3"}],"database_specific":{"cpe":"cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.18.0"},{"fixed":"1.18.18"},{"introduced":"1.19.0"},{"fixed":"1.19.10"},{"introduced":"1.20.0"},{"fixed":"1.20.6"}],"source":"CPE_RANGE"}}],"versions":["v1.18.18-rc.0","v1.20.6-rc.0","v1.19.10-rc.0","v1.20.5","v1.19.9","v1.18.17","v1.20.5-rc.0","v1.20.4","v1.19.9-rc.0","v1.20.4-rc.0","v1.18.17-rc.0","v1.20.3","v1.19.8","v1.18.16","v1.18.16-rc.0","v1.20.3-rc.0","v1.19.8-rc.0","v1.20.2","v1.19.7","v1.18.15","v1.18.15-rc.0","v1.20.2-rc.0","v1.19.7-rc.0","v1.18.14","v1.19.6","v1.20.1","v1.18.14-rc.1","v1.19.6-rc.1","v1.20.1-rc.1","v1.18.14-rc.0","v1.18.13","v1.19.6-rc.0","v1.19.5","v1.20.1-rc.0","v1.20.0","v1.18.13-rc.0","v1.18.12","v1.19.5-rc.0","v1.19.4","v1.18.12-rc.1","v1.18.11-rc.0","v1.18.10","v1.19.4-rc.0","v1.19.3","v1.18.10-rc.0","v1.19.3-rc.0","v1.18.9","v1.19.2","v1.19.2-rc.0","v1.19.1","v1.19.1-rc.0","v1.19.0","v1.18.9-rc.0","v1.18.8","v1.18.8-rc.1","v1.18.7-rc.0","v1.18.6","v1.18.6-rc.0","v1.18.5","v1.18.5-rc.1","v1.18.5-rc.0","v1.18.4","v1.18.4-rc.0","v1.18.3","v1.18.3-beta.0","v1.18.2","v1.18.2-beta.0","v1.18.1","v1.18.1-beta.0","v1.18.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25736.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/kubernetes/kubernetes/pull/99958"},{"type":"ADVISORY","url":"https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20231221-0003/"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}