CVE-2021-20198

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 32% 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in the OpenShift Installer before version v0.9.0-master.0.20210125200451-95101da940b0. During installation of OpenShift Container Platform 4 clusters, bootstrap nodes are provisioned with anonymous authentication enabled on kubelet port 10250. A remote attacker able to reach this port during installation can make unauthenticated /exec requests to execute arbitrary commands within running containers. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
76.5%
KEV
Not listed

Published

February 23, 2021

Last Modified

November 21, 2024

References (2)

Vendor Advisories for CVE-2021-20198(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift4/ose-installer:v4.5.0-202101301520.p02021-02-09redhat
redhatopenshift4/ose-installer:v4.6.0-202101300140.p02021-02-08redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 10× in last 7d / 48× 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.

  1. 2026-07-16 17:00 UTCEPSS rescore
  2. 2026-07-15 16:55 UTCEPSS rescore
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  12. 2026-07-09 19:07 UTCEPSS rescore
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  14. 2026-07-07 13:43 UTCEPSS rescore
  15. 2026-07-06 16:25 UTCEPSS rescore
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  22. 2026-07-02 16:57 UTCEPSS rescore
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  24. 2026-06-30 23:20 UTCEPSS rescore
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  1. 2026-06-29 14:04 UTCEPSS rescore
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  6. 2026-06-27 03:06 UTCEPSS rescore
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  8. 2026-06-25 13:48 UTCEPSS rescore
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  18. 2026-06-21 01:58 UTCEPSS rescore
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  20. 2026-06-19 19:24 UTCEPSS rescore
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  22. 2026-06-18 17:51 UTCEPSS rescore
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  24. 2026-06-17 17:51 UTCEPSS rescore
  25. 2026-06-16 17:50 UTCEPSS rescore
  26. 2026-06-15 17:46 UTCEPSS rescore
  27. 2026-06-14 23:15 UTCEPSS rescore
  28. 2026-06-13 22:58 UTCEPSS rescore
  29. 2026-06-12 23:10 UTCEPSS rescore
  30. 2026-06-12 23:10 UTCEPSS rescore
  31. 2026-06-11 13:58 UTCEPSS rescore
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  37. 2026-06-07 15:23 UTCEPSS rescore
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  39. 2026-06-06 13:46 UTCEPSS rescore
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  44. 2026-06-05 06:09 UTCEPSS rescore
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  48. 2026-06-02 20:11 UTCEPSS rescore
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  50. 2026-06-01 13:50 UTCEPSS rescore
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  52. 2026-05-31 22:29 UTCEPSS rescore
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  56. 2026-05-29 13:42 UTCEPSS rescore
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  59. 2026-05-27 13:39 UTCEPSS rescore
  60. 2026-05-26 20:31 UTCEG score recompute
  61. 2026-05-26 20:31 UTCVendor advisory
  62. 2026-05-26 13:42 UTCEPSS rescore
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  64. 2026-05-26 07:17 UTCEPSS rescore
  65. 2026-05-26 07:17 UTCEPSS rescore
  66. 2026-05-24 16:49 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-20198?
CVE-2021-20198 is a high vulnerability published on February 23, 2021. A flaw was found in the OpenShift Installer before version v0.9.0-master.0.20210125200451-95101da940b0. During installation of OpenShift Container Platform 4 clusters, bootstrap nodes are provisioned with anonymous authentication enabled on kubelet port 10250. A remote attacker able to reach this…
When was CVE-2021-20198 disclosed?
CVE-2021-20198 was first published in the National Vulnerability Database on February 23, 2021, 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-2021-20198 actively exploited?
CVE-2021-20198 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-20198?
CVE-2021-20198 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2021-20198?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20198, 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.

Dependency Blast Radius

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