What is CVE-2021-27893?

CVE-2021-27893 is a high-severity vulnerability in Microsoft Windows. CVSS score: 7.0/10. Published 2021-03-15.

How severe is CVE-2021-27893?

High severity. CVSS v3 base score is 7.0 out of 10.

Vulnerability in Microsoft Windows

CVE-2021-27893

SSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation in nonstandard conditions. ConnectSecure on Windows is affected.

Published 2021-03-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.2th percentile), scored 2026-10-21.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

References

info.ssh.com/tectia-vulnerability-cve-2021-27893 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-27893?: CVE-2021-27893 is a high-severity vulnerability in Microsoft Windows. CVSS score: 7.0/10. Published 2021-03-15.
How severe is CVE-2021-27893?: High severity. CVSS v3 base score is 7.0 out of 10.