How severe is CVE-2021-41393?

CVE-2021-41393 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41393 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41393?

CVE-2021-41393 affects Goteleport Teleport. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41393?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-41393 published?

CVE-2021-41393 was published on 2021-09-18 and last updated on 2026-06-17.

CVE-2021-41393

CVE-2021-41393 is a critical-severity vulnerability in Goteleport Teleport with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Goteleport Teleport
Published: 2021-09-18
Last modified: 2026-06-17

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.

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 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41393 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41393?: CVE-2021-41393 affects Goteleport Teleport. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41393?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-41393 published?: CVE-2021-41393 was published on 2021-09-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:goteleport:teleport:*:*:*:*:*:*:*:*

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