SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation.
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.
Why it matters now
EPSS 0.01076 65th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ssh:tectia_client:*:*:*:*:*:*:*:* | before 6.4.19 | Vulnerable | SSH |
| cpe:2.3:a:ssh:tectia_connectsecure:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | SSH |
| cpe:2.3:a:ssh:tectia_server:*:*:*:*:*:*:*:* | before 6.4.19 | Vulnerable | SSH |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:ssh:tectia_client:*:*:*:*:*:*:*:* Versions before 6.4.19 Vulnerable ·SSH
- cpe:2.3:a:ssh:tectia_connectsecure:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·SSH
- cpe:2.3:a:ssh:tectia_server:*:*:*:*:*:*:*:* Versions before 6.4.19 Vulnerable ·SSH
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27891
- 2026-10-03 Alias added: GHSA-pc4j-6344-24x7
References
More SSH Tectia Client vulnerabilities
- TI-2008-04912 Error handling in the SSH protocol in (1) SSH Tectia Client and Server and Connector 4.0… CVSS 3.1LOW 3.7
- TI-2021-09232 SSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation. CVSS 3.1HIGH 7.8
- TI-2007-05397 ssh-signer in SSH Tectia Client and Server 5.x before 5.2.4, and 5.3.x before 5.3.6, on… CVSS 2.0HIGH 7.2
- TI-2006-04168 Unquoted Windows search path vulnerability in multiple SSH Tectia products, including… CVSS 2.0HIGH 7.2
- TI-2021-09233 SSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation in… CVSS 3.1HIGH 7.0
- TI-2006-05295 SSH Tectia Client/Server/Connector 5.1.0 and earlier, Manager 2.2.0 and earlier, and… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2021-27891 · CVE Program
- CVE-2021-27891 · NVD
- FIRST EPSS
- GHSA-pc4j-6344-24x7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences