CVE-2021-27891

Name: CVE-2021-27891
Creator: NVD / NIST
Published: 2021-03-15T15:15:15.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-27891 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Ssh	Tectia Client	< 6.4.19
Ssh	Tectia Connectsecure	All versions
Ssh	Tectia Server	< 6.4.19

References

https://info.ssh.com/tectia-vulnerability-cve-2021-27891Vendor Advisory
https://info.ssh.com/tectia-vulnerability-cve-2021-27891Vendor Advisory

Timeline

Published: Mar 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27891?

SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.

How severe is CVE-2021-27891?

CVE-2021-27891 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27891?

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-2021-27891?

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

Scan your code now

Source: NVD / NIST