Is CVE-2021-27475 actively exploited?

No active exploitation of CVE-2021-27475 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27475 be exploited remotely?

No. CVE-2021-27475 requires local access to exploit.

What is the CVSS score of CVE-2021-27475?

CVE-2021-27475 has a CVSS score of 8.6 (HIGH).

HOME VULNERABILITIESCVE-2021-27475

HIGH

CVE-2021-27475

CWE-502Published: March 23, 2022· Updated: Jun 17, 2026

8.6

CVSS v3.1

Official Description

Rockwell Automation Connected Components Workbench v12.00.00 and prior does not limit the objects that can be deserialized. This vulnerability allows attackers to craft a malicious serialized object that, if opened by a local user in Connected Components Workbench, may result in remote code execution. This vulnerability requires user interaction to be successfully exploited.

NVD Source

Technical Analysis

CVE-2021-27475 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.