CVE-2021-22787 : Vulnerability Insights and Analysis

A CWE-20 vulnerability in Modicon devices could allow attackers to trigger a denial of service by sending a specially crafted HTTP request to the device's web server.

Understanding CVE-2021-22787

This CVE identifier corresponds to an Improper Input Validation vulnerability impacting various Modicon products.

What is CVE-2021-22787?

The vulnerability is due to improper input validation, allowing threat actors to disrupt device operations via malicious HTTP requests.

The Impact of CVE-2021-22787

Exploitation of this vulnerability could lead to denial of service on affected Modicon devices, affecting their availability and performance.

Technical Details of CVE-2021-22787

This section dives into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability involves a failure to adequately validate input, enabling attackers to render devices unresponsive through crafted HTTP requests.

Affected Systems and Versions

Modicon M340 CPUs (BMXP34), Modicon M340 X80 Ethernet Communication Modules, Modicon Premium Processors, Modicon Quantum Processors, and Communication Modules are among the impacted devices and versions.

Exploitation Mechanism

Threat actors can exploit the vulnerability by sending specially crafted HTTP requests to the web server of affected Modicon devices.

Mitigation and Prevention

Understanding how to mitigate and prevent the exploitation of CVE-2021-22787 is crucial.

Immediate Steps to Take

Implementing network segmentation, access controls, and monitoring can help mitigate immediate risks associated with the vulnerability.

Long-Term Security Practices

Regular security assessments, patch management, and security training can enhance the overall security posture and resilience of the affected devices.

Patching and Updates

Ensuring devices are updated with the latest patches and firmware releases from Schneider Electric is essential to address the vulnerability effectively.