CVE-2021-27018

Name: CVE-2021-27018
Creator: NVD / NIST
Published: 2021-08-30T18:15:08.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-27018 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The mechanism which performs certificate validation was discovered to have a flaw that resulted in certificates signed by an internal certificate authority to not be properly validated. This issue only affects clients that are configured to utilize Tenable.sc as the vulnerability data source.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

The mechanism which performs certificate validation was discovered to have a flaw that resulted in certificates signed by an internal certificate authority to not be properly validated. This issue only affects clients that are configured to utilize Tenable.sc as the vulnerability data source.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.54%

41.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Puppet	Remediate	< 2.0.1

References

https://puppet.com/security/cve/CVE-2021-27018Vendor Advisory
https://puppet.com/security/cve/CVE-2021-27018Vendor Advisory

Timeline

Published: Aug 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27018?

How severe is CVE-2021-27018?

CVE-2021-27018 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27018?

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-2021-27018?

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

Scan your code now

Source: NVD / NIST