CVE-2020-8557

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
39.9%
KEV
Not listed

Published

July 23, 2020

Last Modified

November 21, 2024

References (6)

Vendor Advisories for CVE-2020-8557(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatatomic-openshift-0:3.11.542-1.git.0.f2fd300.el72021-10-28redhat
redhatopenshift4/ose-hyperkube:v4.3.37-202009151447.p02020-09-23redhat
redhatopenshift-0:4.3.37-202009120213.p0.git.0.dffefe4.el82020-09-23redhat
redhatopenshift4/ose-hyperkube:v4.4.0-202008250319.p02020-09-01redhat
redhatopenshift-0:4.4.0-202008250319.p0.git.0.d653415.el72020-09-01redhat
redhatopenshift-0:4.5.0-202008130146.p0.git.0.aaf1d57.el72020-08-24redhat
redhatopenshift4/ose-hyperkube:v4.5.0-202008130146.p02020-08-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
k8s.io/kubernetes—1.18.6—
k8s.io/kubernetes/pkg/kubelet—1.18.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-22 22:41 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  9. 2026-07-19 08:22 UTCOSV refresh
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  12. 2026-07-01 14:21 UTCOSV refresh
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  40. 2026-06-13 22:58 UTCEPSS rescore
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  42. 2026-06-13 22:13 UTCOSV refresh
  43. 2026-06-12 23:10 UTCEPSS rescore
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  45. 2026-06-11 13:58 UTCEPSS rescore
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  72. 2026-05-27 13:39 UTCEPSS rescore
  73. 2026-05-27 00:52 UTCEG score recompute
  74. 2026-05-27 00:52 UTCVendor advisory
  75. 2026-05-26 23:13 UTCOSV refresh

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Frequently asked(5)

What is CVE-2020-8557?
CVE-2020-8557 is a medium vulnerability published on July 23, 2020. 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…
When was CVE-2020-8557 disclosed?
CVE-2020-8557 was first published in the National Vulnerability Database on July 23, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-8557 actively exploited?
CVE-2020-8557 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-8557?
CVE-2020-8557 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2020-8557?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8557, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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