CVE-2021-22790 : What You Need to Know
Learn about CVE-2021-22790, a CWE-125: Out-of-bounds Read vulnerability in Modicon PLC controllers and simulators. Find out how to mitigate the issue and secure your systems effectively.
A vulnerability known as CWE-125: Out-of-bounds Read has been identified in Modicon PLC controllers and simulators. This vulnerability could lead to a Denial of Service when updating the controller application with a specially crafted project file. The affected products include Modicon M580 CPU, Modicon M340 CPU, Modicon MC80, Modicon Momentum Ethernet CPU, PLC Simulator for EcoStruxure Control Expert, Modicon Quantum CPU, and Modicon Premium CPU.
Understanding CVE-2021-22790
This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-22790.
What is CVE-2021-22790?
The CVE-2021-22790 vulnerability is categorized as CWE-125: Out-of-bounds Read, posing a threat to the integrity and availability of Modicon PLC controllers and simulators.
The Impact of CVE-2021-22790
The vulnerability could result in a Denial of Service situation when malicious project files are utilized to update the controller application, affecting various Modicon devices.
Technical Details of CVE-2021-22790
Explore the specifics of the vulnerability, including its description, affected systems, and exploitation mechanism.
Vulnerability Description
CVE-2021-22790 involves an Out-of-bounds Read issue within the Modicon PLC controllers and simulators, potentially leading to service interruption.
Affected Systems and Versions
The vulnerability affects a range of Modicon products, including Modicon M580 CPU, Modicon M340 CPU, Modicon MC80, Modicon Momentum Ethernet CPU, and more, across all versions.
Exploitation Mechanism
By employing specially crafted project files during the controller application update process, threat actors can trigger the vulnerability and initiate a Denial of Service attack.
Mitigation and Prevention
Discover the essential steps to address and prevent CVE-2021-22790, safeguarding the integrity of Modicon devices.
Immediate Steps to Take
It is crucial to apply security patches promptly, restrict access to vulnerable systems, and monitor for any unauthorized activities on the network.
Long-Term Security Practices
Implement robust security policies, conduct regular security assessments, and keep systems up to date with the latest patches and updates to mitigate future vulnerabilities.
Patching and Updates
Stay informed about security advisories from Schneider Electric, apply relevant patches, and ensure all Modicon devices are running the latest firmware to enhance cybersecurity resilience.