CVE-2021-33012 : Vulnerability Insights and Analysis

Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, resulting in a denial-of-service condition.

Understanding CVE-2021-33012

This CVE affects the Rockwell Automation MicroLogix 1100, all versions, enabling a potential attacker to disrupt operations remotely.

What is CVE-2021-33012?

The vulnerability in Rockwell Automation MicroLogix 1100 allows an attacker to induce a denial-of-service by sending specific commands, causing the controller to malfunction when switched to RUN mode.

The Impact of CVE-2021-33012

If successfully exploited, this vulnerability can lead to the controller faulting whenever it transitions to the RUN mode, disrupting normal operations.

Technical Details of CVE-2021-33012

This section delves deeper into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from a lack of proper input validation in Rockwell Automation MicroLogix 1100, permitting unauthorized commands that trigger a denial-of-service scenario.

Affected Systems and Versions

All versions of Rockwell Automation MicroLogix 1100 are impacted by this vulnerability.

Exploitation Mechanism

By sending malicious commands remotely, an attacker can exploit this vulnerability and disrupt the controller when it enters the RUN mode.

Mitigation and Prevention

Protecting systems against CVE-2021-33012 is imperative to ensure operational integrity and security.

Immediate Steps to Take

Implement network segmentation, access controls, and monitor network traffic to detect and prevent unauthorized access.

Long-Term Security Practices

Regularly update the firmware and security patches provided by the vendor to safeguard against known vulnerabilities.

Patching and Updates

Stay vigilant for security advisories from Rockwell Automation and promptly apply patches to address potential vulnerabilities.