CVE-2020-8557

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.

• CWE-400
• CWE-400

• https://github.com/kubernetes/kubernetes/issues/93032Issue Tracking, Patch, Third Party Advisory
• https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20200821-0002/Third Party Advisory
• https://github.com/kubernetes/kubernetes/issues/93032Issue Tracking, Patch, Third Party Advisory
• https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20200821-0002/Third Party Advisory

Published

Jul 23, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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• CVE-2020-8549Stored XSS in the Strong Testimonials plugin before 2.40.1 f…6.1
• CVE-2020-8551The Kubelet component in versions 1.15.0-1.15.9, 1.16.0-1.16…6.5
• CVE-2020-8552The Kubernetes API server component in versions prior to 1.1…4.3
• CVE-2020-8553The Kubernetes ingress-nginx component prior to version 0.28…5.9
• CVE-2020-8554Kubernetes API server in all versions allow an attacker who …5
• CVE-2020-8555The Kubernetes kube-controller-manager in versions v1.0-1.14…6.3
• CVE-2020-8558The Kubelet and kube-proxy components in versions 1.1.0-1.16…8.8
• CVE-2020-8559The Kubernetes kube-apiserver in versions v1.6-v1.15, and ve…6.8
• CVE-2020-8561A security issue was discovered in Kubernetes where actors t…4.1
• CVE-2020-8562As mitigations to a report from 2019 and CVE-2020-8555, Kube…3.1
• CVE-2020-8563In Kubernetes clusters using VSphere as a cloud provider, wi…5.5
• CVE-2020-8564In Kubernetes clusters using a logging level of at least 4, …5.5