CVE-2021-22792 : Vulnerability Insights and Analysis
Learn about CVE-2021-22792, a vulnerability in Schneider Electric Modicon PLC controllers/simulators that could lead to a Denial of Service. Find out the impact, affected systems, and mitigation steps.
A vulnerability labeled as CVE-2021-22792 has been identified in Modicon PLC controllers/simulators. This vulnerability, categorized as CWE-476: NULL Pointer Dereference, could lead to a Denial of Service when updating the controller application with a malicious project file. This vulnerability affects various products and versions from Schneider Electric.
Understanding CVE-2021-22792
This section delves into the specifics of the CVE-2021-22792 vulnerability.
What is CVE-2021-22792?
CVE-2021-22792 is a NULL Pointer Dereference vulnerability found in Modicon PLC controllers/simulators. It could allow an attacker to cause a Denial of Service condition by exploiting the controller application update process.
The Impact of CVE-2021-22792
The impact of this vulnerability is the potential disruption of services provided by affected Modicon PLC devices, leading to operational downtime and loss of control over the system.
Technical Details of CVE-2021-22792
This part discusses the technical specifics of CVE-2021-22792.
Vulnerability Description
The vulnerability stems from a NULL Pointer Dereference issue, which can be triggered during the application update process, causing the device to crash and resulting in a denial of service condition.
Affected Systems and Versions
The vulnerability affects a wide range of Schneider Electric products, including Modicon M580 CPU, Modicon M340 CPU, Modicon MC80, Modicon Momentum Ethernet CPU, and others, encompassing various versions.
Exploitation Mechanism
To exploit CVE-2021-22792, an attacker would need to craft a project file specifically designed to trigger the NULL Pointer Dereference vulnerability during the controller application update.
Mitigation and Prevention
In this section, we explore the steps to mitigate and prevent the exploitation of CVE-2021-22792.
Immediate Steps to Take
Immediately apply security patches provided by Schneider Electric to address the vulnerability and prevent exploitation by malicious actors.
Long-Term Security Practices
Incorporate regular security updates and patches into your maintenance routine to protect against known vulnerabilities and ensure the security of your systems.
Patching and Updates
Stay informed about security advisories from Schneider Electric and apply relevant patches and updates promptly to maintain a secure environment.