CVE-2020-8557: Kubernetes

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Kubernetes Kubernetes: before 1.16.13 (fixed in 1.16.13); from 1.17.0, before 1.17.9 (fixed in 1.17.9); from 1.18.0, before 1.18.6 (fixed in 1.18.6)

Published 2020-07-23. Last modified 2026-06-17.