CVE-2021-27476

Rockwell Automation recommends the following software/PC-based mitigation strategies:
Run all software as User, not as an Administrator, to minimize the impact of malicious code on the infected system.
Use Microsoft AppLocker or other similar allow list applications to help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at Knowledge Base Article QA17329
Ensure the least-privilege user principle is followed, and user/service account access to shared resources (such as a database) is only granted with a minimum number of rights as needed.

Rockwell Automation recommends the following general mitigations:
Use trusted software, software patches, antivirus/antimalware programs and interact only with trusted web sites and attachments.
Minimize network exposure for all control system devices and/or systems and ensure they are not accessible from the Internet. For further information about the risks of unprotected Internet accessible control systems, please see Knowledgebase Article PN715
Locate control system networks and devices behind firewalls and isolate them from the business network.
When remote access is required, use secure methods, such as virtual private networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize a VPN is only as secure as the connected devices.