CVE-2021-22788 : Security Advisory and Response
Discover the CWE-787 Out-of-bounds Write vulnerability in Modicon devices. Learn the impact, affected systems, and mitigation steps for CVE-2021-22788.
A CWE-787 vulnerability has been identified in the Modicon M340 CPUs and various related modules and processors. This vulnerability could potentially lead to a denial of service when an attacker sends a specially crafted HTTP request to the affected device.
Understanding CVE-2021-22788
This section delves into the specifics of the CVE-2021-22788 vulnerability.
What is CVE-2021-22788?
The CVE-2021-22788 vulnerability is classified as CWE-787, an Out-of-bounds Write issue. It can be exploited through a specially crafted HTTP request to the web server of the affected devices.
The Impact of CVE-2021-22788
The impact of this vulnerability is the potential denial of service that could be triggered by a malicious actor.
Technical Details of CVE-2021-22788
In this section, we explore the technical details of CVE-2021-22788.
Vulnerability Description
The vulnerability involves an out-of-bounds write that occurs when a specific HTTP request is sent to the web server of the affected devices.
Affected Systems and Versions
The following systems and versions are impacted: Modicon M340 CPUs (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules, Modicon Premium Processors with integrated Ethernet, Modicon Quantum Processors with Integrated Ethernet, Modicon Quantum Communication Modules, and Modicon Premium Communication Modules.
Exploitation Mechanism
The vulnerability can be exploited by sending a specially crafted HTTP request to the web server of the affected devices.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent exploitation of CVE-2021-22788.
Immediate Steps to Take
Immediate steps include applying relevant patches and updates to mitigate the vulnerability.
Long-Term Security Practices
Implementing network segmentation, access controls, and regular security assessments are recommended for long-term security.
Patching and Updates
Ensuring that all affected systems and devices are updated with the latest patches is crucial to address CVE-2021-22788.