CVE-2021-34593 : Security Advisory and Response

A detailed overview of CVE-2021-34593, a vulnerability affecting CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, potentially leading to denial-of-service attacks.

Understanding CVE-2021-34593

This section provides insights into the nature and impact of the CVE-2021-34593 vulnerability.

What is CVE-2021-34593?

CVE-2021-34593 affects CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT, allowing unauthenticated crafted invalid requests to cause various denial-of-service conditions.

The Impact of CVE-2021-34593

In case of exploitation, running PLC programs could be halted, memory leaks might occur, and communication clients could be blocked from accessing the PLC.

Technical Details of CVE-2021-34593

Here we delve deeper into the technical aspects of CVE-2021-34593.

Vulnerability Description

The vulnerability arises due to unauthenticated crafted invalid requests in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT, potentially leading to denial-of-service scenarios.

Affected Systems and Versions

CODESYS V2 products with versions prior to V2.4.7.56 are affected, including Runtime Toolkit 32 bit full and PLCWinNT.

Exploitation Mechanism

By sending malicious unauthenticated requests to vulnerable CODESYS V2 systems, an attacker can disrupt PLC programs and system communications.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-34593.

Immediate Steps to Take

Update to the patched versions released by CODESYS GmbH to address the vulnerabilities in the affected products.

Long-Term Security Practices

Implement security best practices such as network segmentation, access controls, and continuous monitoring to enhance overall security posture.

Patching and Updates

Ensure that your CODESYS V2 products are regularly updated with the latest security patches to prevent exploitation of known vulnerabilities.