CVE-2021-34586 Explained : Impact and Mitigation

This article provides an overview of CVE-2021-34586, a vulnerability in the CODESYS V2 web server that could lead to a denial-of-service condition.

Understanding CVE-2021-34586

This section delves into the specifics of the vulnerability.

What is CVE-2021-34586?

The vulnerability exists in the CODESYS V2 web server before version V1.1.9.22, where crafted requests can trigger a Null pointer dereference, potentially leading to a denial-of-service scenario.

The Impact of CVE-2021-34586

With a CVSS base score of 7.5, this vulnerability has a high severity, affecting the availability of the web server.

Technical Details of CVE-2021-34586

This section explores the technical aspects of CVE-2021-34586.

Vulnerability Description

Crafted web server requests in CODESYS V2 web server could cause a Null pointer dereference, resulting in a denial-of-service condition.

Affected Systems and Versions

The vulnerability affects all web servers running versions earlier than V1.1.9.22 of the CODESYS V2 web server.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted requests to the web server, triggering the Null pointer dereference flaw.

Mitigation and Prevention

Understanding how to mitigate and prevent CVE-2021-34586 is crucial for maintaining system security.

Immediate Steps to Take

Users are advised to update their CODESYS V2 web server to version V1.1.9.22 to address the vulnerability and prevent exploitation.

Long-Term Security Practices

Regularly monitoring for security updates and applying patches promptly is essential to prevent similar vulnerabilities in the future.

Patching and Updates

CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server to resolve the vulnerability. Users should update their systems to this version to mitigate the risk.