CVE-2021-22746 Explained : Impact and Mitigation

This CVE-2021-22746 article provides an in-depth understanding of an 'Improper Check for Unusual or Exceptional Conditions' vulnerability found in Triconex Model 3009 MP installed on Tricon V11.3.x systems.

Understanding CVE-2021-22746

This section delves into the nature of the vulnerability and its potential impact.

What is CVE-2021-22746?

The vulnerability involves a flaw in Triconex Model 3009 MP that could lead to a module reset due to malformed TriStation packets in a specific operating mode.

The Impact of CVE-2021-22746

The vulnerability can be exploited to cause a module reset and disrupt the normal operations of the affected systems.

Technical Details of CVE-2021-22746

In this section, the technical aspects of the vulnerability are discussed.

Vulnerability Description

The vulnerability arises due to an improper validation mechanism when TCM receives malformed TriStation packets.

Affected Systems and Versions

Triconex Model 3009 MP installed on Tricon V11.3.x systems is vulnerable to this issue.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted TriStation packets while the write-protect keyswitch is in the program position.

Mitigation and Prevention

This section outlines the essential steps to mitigate the CVE-2021-22746 vulnerability.

Immediate Steps to Take

It is crucial to apply security patches provided by the vendor and restrict network access to critical systems.

Long-Term Security Practices

Implementing network segmentation, using firewalls, and regularly updating security measures can help prevent such vulnerabilities.

Patching and Updates

Regularly check for security updates from the vendor and apply patches promptly to avoid exploitation.