← Vulnerability feed

Vulnerability record · CVE-2021-27893 · published 15 March 2021

CVE-2021-27893: Ssh tectia client vulnerability

Ssh · Tectia Client

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

7.0 CVSS 3.1 High EPSS 0.38% · top 70.5%
7.0CVSS 3.1 base score, v2 4.4
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://info.ssh.com/tectia-vulnerability-cve-2021-27893 Vendor Advisory
https://info.ssh.com/tectia-vulnerability-cve-2021-27893 Vendor Advisory

Track CVE-2021-27893 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2012-5975Ssh tectia server improper authentication vulnerabilityThe SSH USERAUTH CHANGE REQUEST feature in SSH Tectia Server 6.0.4 through 6.0.20, 6.1.0 through 6.1.12, 6.2.0 through 6.2.5, and 6.3.0 through 6.3.2…EPSS 36%8.8CVE-2021-27891Ssh tectia client vulnerabilitySSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.EPSS 1.0%7.8CVE-2021-27892Ssh tectia client vulnerabilitySSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation. ConnectSecure on Windows is affected.EPSS 0.25%7.5CVE-2005-4310Ssh tectia server vulnerabilitySSH Tectia Server 5.0.0 (A, F, and T), when allowing host-based authentication only, allows users to log in with the wrong credentials.EPSS 1.4%7.2CVE-2007-5616Ssh tectia client vulnerabilityssh-signer in SSH Tectia Client and Server 5.x before 5.2.4, and 5.3.x before 5.3.6, on Unix and Linux allows local users to gain privileges via unsp…EPSS 0.94%7.2CVE-2006-4315Ssh tectia client vulnerabilityUnquoted Windows search path vulnerability in multiple SSH Tectia products, including Client/Server/Connector 5.0.0 and 5.0.1 and Client/Server befor…EPSS 0.34%5.0CVE-2006-5484Ssh tectia client vulnerabilitySSH Tectia Client/Server/Connector 5.1.0 and earlier, Manager 2.2.0 and earlier, and other products, when using an RSA key with exponent 3, removes P…EPSS 1.4%4.6CVE-2005-2146Ssh tectia server vulnerabilitySSH Tectia Server 4.3.1 and earlier, and SSH Secure Shell for Windows Servers, uses insecure permissions when generating the Secure Shell host identi…EPSS 0.31%

Source: NIST National Vulnerability Database (record CVE-2021-27893), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.