CVE-2021-27475 Rockwell Automation Connected Components Workbench Deserialization of Untrusted Data

High 8.6 Published 23 Mar 2022 Updated 16 Apr 2025

Attackers can achieve remote code execution by tricking users into opening malicious serialized objects in Rockwell Automation Connected Components Workbench.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-27475?

CVE-2021-27475 is a high-severity unsafe deserialization vulnerability in Rockwell Automation Connected Components Workbench, published on 23 Mar 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

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.

Weakness: CWE-502

Which versions are affected by CVE-2021-27475?

It affects 1 product.

Products include Rockwellautomation Connected Components Workbench.

How do I fix CVE-2021-27475?

No fix has been published for CVE-2021-27475 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2021-27475 being exploited?

There is no known exploitation of CVE-2021-27475 in the wild and no public exploit code.

Sources

Also known as GHSA-q489-3x56-hq57.