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CVE-2020-8557
Kubernetes node disk Denial of Service by writing to container /etc/hosts
Medium5.5EPSS 0.43%
- Published
- Updated
- Reserved
- Assigned by
- 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| kubernetesCNA (assigner) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.43% · top 62% of all CVEs (7 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 1.15
- affected 1.14
- affected 1.13
- affected 1.12
- affected 1.11
- affected 1.10
- affected 1.9
- affected 1.8
- affected 1.7
- affected 1.6
- affected 1.5
- affected 1.4
- affected 1.3
- affected 1.2
- affected 1.1
- affected 1.18 – < 1.18.6
- affected 1.17 – < 1.17.9
- affected 1.16 – < 1.16.13
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gok8s.io/kubernetes/pkg/kubeletGHSA-55qj-gj3x-jq9r (opens in a new tab)
References (3)
- https://github.com/kubernetes/kubernetes/issues/93032 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://security.netapp.com/advisory/ntap-20200821-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-55qj-gj3x-jq9r (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-8557)Record last updated .