CVE-2021-34585 : What You Need to Know
Discover the details of CVE-2021-34585, a high-severity vulnerability in CODESYS V2 web server prior to V1.1.9.22 that could lead to denial of service attacks. Learn about the impact, technical specifics, and mitigation steps.
A crafted web server request in CODESYS V2 web server prior to version V1.1.9.22 can lead to a denial of service due to a pointer dereference vulnerability. Learn more about the impact, technical details, and mitigation steps below.
Understanding CVE-2021-34585
This section covers the essential details of the CVE-2021-34585 vulnerability in the CODESYS V2 web server.
What is CVE-2021-34585?
The vulnerability in CODESYS V2 allows crafted web server requests to trigger a parser error, potentially leading to a pointer dereference with an invalid address and resulting in a denial of service scenario.
The Impact of CVE-2021-34585
The impact of this vulnerability is rated as high, with a CVSS v3.1 base score of 7.5. An attacker can exploit this issue via a network with low attack complexity, causing a high availability impact.
Technical Details of CVE-2021-34585
This section delves into the technical aspects of CVE-2021-34585, including a description of the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
Crafted requests in the CODESYS V2 web server before V1.1.9.22 can trigger a parser error, potentially leading to a pointer dereference with an invalid address, resulting in a denial of service.
Affected Systems and Versions
The vulnerability affects CODESYS V2 web servers with versions prior to V1.1.9.22.
Exploitation Mechanism
An attacker can exploit this vulnerability by sending specially crafted web server requests, triggering a parser error and leading to a denial of service situation.
Mitigation and Prevention
Learn how to address and prevent the CVE-2021-34585 vulnerability in CODESYS V2 web servers.
Immediate Steps to Take
CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server to address this vulnerability. Users are advised to update to this version promptly.
Long-Term Security Practices
Incorporate regular security updates and patches into your system maintenance routine to mitigate the risk of similar vulnerabilities in the future.
Patching and Updates
Ensure that your CODESYS V2 web server is always up to date with the latest security patches, such as version V1.1.9.22 provided by CODESYS GmbH.