Is CVE-2021-27891 in the CISA KEV catalog?

No. CVE-2021-27891 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27891?

CVE-2021-27891 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-27891?

CVE-2021-27891 has an EPSS score of 1.04% (60th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27891?

Upgrade tectia client to 6.4.19 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-27891

HIGH

8.8

CVSS v3

NVD

Description

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

How to fix

Remediation Available

tectia clientNVD

Affected:< 6.4.19Fixed in:6.4.19CVE-2021-27891derived from NVD

tectia serverNVD

Affected:< 6.4.19Fixed in:6.4.19CVE-2021-27891derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.04%probability of exploitation in 30 days

60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

Vendor Advisory1

info.ssh.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.