{"id":"CVE-2020-8557","aliases":["ALPINE-CVE-2020-8557","DEBIAN-CVE-2020-8557","EUVD-2024-1098","GHSA-55qj-gj3x-jq9r","GO-2024-2753","RHSA-2020:3519","RHSA-2020:3579","RHSA-2020:3808","RHSA-2021:3915","SUSE-RU-2020:2204-1","UBUNTU-CVE-2020-8557","openSUSE-SU-2025:15424-1"],"status":"published","title":"Kubernetes node disk Denial of Service by writing to container /etc/hosts","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00434,"percentile":0.38168,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2020-07-23T16:59:38Z","modified":"2026-11-03T06:32:31Z","fixes":[{"ecosystem":"Go","package":"k8s.io/kubernetes/pkg/kubelet","fixed_in":["1.16.13","1.17.9","1.18.6"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.13","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"k3s","fixed_in":["1.18.6.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"kubernetes","fixed_in":["1.18.5-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"kubernetes","fixed_in":["1.18.5-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"kubernetes","fixed_in":["1.18.5-1"],"sources":["osv"]},{"ecosystem":"Go","package":"k8s.io/kubernetes","fixed_in":["1.16.13","1.17.9","1.18.6"],"sources":["osv"]},{"ecosystem":"Red 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node disk Denial of Service by writing to container /etc/hosts","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T16:59:38.58Z","modified":"2024-09-17T03:14:05.177Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:50.545879Z"}],"euvd":[{"id":"EUVD-2024-1098","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T16:59:38Z","modified":"2024-09-17T03:14:05Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:28:33.372362Z"}],"ghsa":[{"id":"GHSA-55qj-gj3x-jq9r","title":"Denial of service in Kubernetes","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2024-04-24T20:01:31Z","modified":"2024-06-10T19:36:52Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:37:54.624184Z"}],"nvd":[{"id":"CVE-2020-8557","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T17:15:12.513Z","modified":"2026-06-17T03:26:32.78Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:10.086163Z"}],"osv":[{"id":"ALPINE-CVE-2020-8557","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T17:15:12.513Z","modified":"2026-11-03T06:32:31.548045518Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T07:17:41.158523Z"},{"id":"CVE-2020-8557","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T17:15:12.513Z","modified":"2026-10-24T10:50:39.779492999Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"DEBIAN-CVE-2020-8557","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2020-07-23T17:15:12.513Z","modified":"2026-10-26T12:02:51.729827808Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:34.311861Z"},{"id":"GHSA-55qj-gj3x-jq9r","title":"Denial of service in Kubernetes","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"published","published":"2024-04-24T20:01:31Z","modified":"2024-06-10T19:36:51Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:37.864461Z"},{"id":"RHSA-2020:3519","title":"Red Hat Security Advisory: OpenShift Container Platform 4.5.7 jenkins and openshift packages security update","status":"published","published":"2024-09-16T04:42:21Z","modified":"2026-08-08T10:01:48Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:3579","title":"Red Hat Security Advisory: OpenShift Container Platform 4.4.19 openshift security update","status":"published","published":"2024-09-16T04:42:34Z","modified":"2026-08-08T10:28:31.678484794Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:3808","title":"Red Hat Security Advisory: OpenShift Container Platform 4.3.38 jenkins and openshift security update","status":"published","published":"2024-09-16T04:48:09Z","modified":"2026-08-08T10:01:50Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2021:3915","title":"Red Hat Security Advisory: OpenShift Container Platform 3.11.542 security update","status":"published","published":"2024-09-16T04:43:05Z","modified":"2025-11-22T12:25:36Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"UBUNTU-CVE-2020-8557","description":"The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.","status":"withdrawn","published":"2020-07-23T17:15:00Z","modified":"2025-07-14T06:45:30.48412Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"id":"GO-2024-2753","title":"Denial of service in Kubernetes in k8s.io/kubernetes","description":"Denial of service in Kubernetes in k8s.io/kubernetes","status":"published","published":"2024-06-10T16:39:03Z","modified":"2026-03-03T04:51:50.697017Z","updated_at":"2026-11-02T15:47:01.453823Z"},{"id":"openSUSE-SU-2025:15424-1","title":"govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media","description":"These are all security issues fixed in the govulncheck-vulndb-0.0.20250807T150727-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-08-08T00:00:00Z","modified":"2026-03-23T04:53:45.821911Z","updated_at":"2026-11-02T16:58:37.810934Z"},{"id":"SUSE-RU-2020:2204-1","title":"Bugfixes on cilium, gangway and skuba and security fix for Kubernetes (cve-2020-8557)","description":" = Required Actions\n\n== Kubernetes (Security fix)\n\nThis fix will be applied to the kubelet daemon running on the nodes by `skuba-update`. \nSee https://documentation.suse.com/suse-caasp/4.2/html/caasp-admin/_cluster_updates.html#_base_os_updates for more details.\nMake sure you look at the Release Notes https://www.suse.com/releasenotes/x86_64/SUSE-CAASP/4/#_changes_in_4_2_2 for any known bug.\n\n== Cilium Bugfix\n\nCilium will be updated by `skuba addon upgrade`. No action is required from your side.\nFor more info see https://documentation.suse.com/suse-caasp/4.2/html/caasp-admin/_cluster_updates.html#_generating_an_overview_of_available_addon_updates\n\n== Gangway bugfix\n\nGangway will be updated by `skuba addon upgrade`. No action is required from your side.\nFor more info see https://documentation.suse.com/suse-caasp/4.2/html/caasp-admin/_cluster_updates.html#_generating_an_overview_of_available_addon_updates\n== Skuba\n\nIn order to update skuba, you need to update the admin workstation.\nSee detailed instructions at https://documentation.suse.com/suse-caasp/4.1/html/caasp-admin/_cluster_updates.html#_update_management_workstation\n  ","status":"published","published":"2020-08-11T12:33:40Z","modified":"2026-02-04T02:13:34.503422Z","updated_at":"2026-11-02T15:53:41.276824Z"}]}}