CVE-2020-8557
Denial of service in Kubernetes in k8s.io/kubernetes
5.5
MEDIUM
CVSS 3.1
EPSS 0.11%
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.
How to fix CVE-2020-8557
To remediate CVE-2020-8557, upgrade the affected package to a fixed version below.
- —upgrade to 1.18.5-1 or later
- —upgrade to 1.16.13 or later
- —upgrade to 1.16.13 or later
Is CVE-2020-8557 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.18.5-1
- >= 1.1.0, < 1.16.13, >= 1.17.0, < 1.17.9, >= 1.18.0, < 1.18.6
- >= 1.1.0, < 1.16.13
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |