Is CVE-2021-27018 actively exploited?

No active exploitation of CVE-2021-27018 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27018 be exploited remotely?

Yes. CVE-2021-27018 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27018?

CVE-2021-27018 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-27018

HIGH

CVE-2021-27018

CWE-295Published: August 30, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-27018 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.