CVE-2021-41393

CRITICALNVD 9.89.8—

9.8

Teleport before 4.4.11, 5.x before 5.2.4, 6.x before 6.2.12, and 7.x before 7.1.1 allows forgery of SSH host certificates in some situations.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 60.9%
KEV: Not listed

Published

September 18, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jun 6, 2026

Patch available. Sources: github_release.

github_release Patch Available

Teleport 7.1.1

Patch available: gravitational/teleport v7.1.1

https://github.com/gravitational/teleport/releases/tag/v7.1.1

github_release Patch Available

Teleport 6.2.12

Patch available: gravitational/teleport v6.2.12

https://github.com/gravitational/teleport/releases/tag/v6.2.12

github_release Patch Available

Teleport 5.2.4

Patch available: gravitational/teleport v5.2.4

https://github.com/gravitational/teleport/releases/tag/v5.2.4

github_release Patch Available

Teleport 4.4.11

Patch available: gravitational/teleport v4.4.11

https://github.com/gravitational/teleport/releases/tag/v4.4.11

Weakness Classification(1)

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

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 15× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 13:46 UTCepss_batch
2026-06-06 13:46 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch

Frequently asked(5)

What is CVE-2021-41393?

CVE-2021-41393 is a critical vulnerability published on September 18, 2021. Teleport before 4.4.11, 5.x before 5.2.4, 6.x before 6.2.12, and 7.x before 7.1.1 allows forgery of SSH host certificates in some situations.

When was CVE-2021-41393 disclosed?

CVE-2021-41393 was first published in the National Vulnerability Database on September 18, 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-2021-41393 actively exploited?

CVE-2021-41393 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 60.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-41393?

CVE-2021-41393 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-41393?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-41393, 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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CVE-2021-41393

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

Teleport 7.1.1

Teleport 6.2.12

Teleport 5.2.4

Teleport 4.4.11

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-41393?

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Advisory Details (4)

Frequently asked(5)

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