CVE-2021-41393

Name: CVE-2021-41393
Creator: NVD / NIST
Published: 2021-09-18T16:15:07.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2021-41393 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.03%

59.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Goteleport	Teleport	< 4.4.11
Goteleport	Teleport	>= 5.0, < 5.2.4
Goteleport	Teleport	>= 6.0, < 6.2.12
Goteleport	Teleport	>= 7.0, < 7.1.1

References

https://github.com/gravitational/teleport/releases/tag/v4.4.11Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v5.2.4Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v6.2.12Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v7.1.1Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v4.4.11Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v5.2.4Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v6.2.12Patch, Third Party Advisory
https://github.com/gravitational/teleport/releases/tag/v7.1.1Patch, Third Party Advisory

Timeline

Published: Sep 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41393?

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.

How severe is CVE-2021-41393?

CVE-2021-41393 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41393?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41393?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST