CVE-2021-34584 : Exploit Details and Defense Strategies

A crafted web server request can trigger a buffer over-read vulnerability in CODESYS V2 web server, potentially leading to a denial-of-service condition. This CVE was discovered by Tenable Research and has a CVSS base score of 9.1.

Understanding CVE-2021-34584

This section will provide insights into the impact, technical details, and mitigation strategies related to CVE-2021-34584.

What is CVE-2021-34584?

CVE-2021-34584 involves a vulnerability in the CODESYS V2 web server that allows attackers to read partial stack or heap memory by sending specially crafted requests.

The Impact of CVE-2021-34584

The impact of this vulnerability is critical, with a CVSS base score of 9.1. It can lead to a denial-of-service condition due to a crash in the web server.

Technical Details of CVE-2021-34584

In this section, we will delve into the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the CODESYS V2 web server allows for reading partial stack or heap memory, leading to a buffer over-read.

Affected Systems and Versions

All web servers running CODESYS V2 versions prior to V1.1.9.22 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted web server requests, triggering the buffer over-read condition.

Mitigation and Prevention

Discover the immediate steps to take and best security practices to mitigate the risks posed by CVE-2021-34584.

Immediate Steps to Take

It is highly recommended to update the CODESYS V2 web server to version V1.1.9.22 to address the noted vulnerability issues.

Long-Term Security Practices

Regularly monitor and update your web server system to ensure vulnerabilities are promptly addressed and patched.

Patching and Updates

CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server, which includes fixes for the identified security issues.