CVE-2021-36765 : What You Need to Know
Stay informed about CVE-2021-36765 affecting CODESYS EtherNetIP. Learn about the vulnerability impact, affected versions, and mitigation steps. Update to version 4.1.0.0 for enhanced security.
A vulnerability has been identified in CODESYS EtherNetIP before version 4.1.0.0 that could lead to a null pointer dereference, potentially exploited through specific EtherNet/IP requests. This could result in a denial-of-service condition or possibly arbitrary code execution.
Understanding CVE-2021-36765
This section delves deeper into the nature and implications of the CVE-2021-36765 vulnerability.
What is CVE-2021-36765?
The vulnerability in CODESYS EtherNetIP before version 4.1.0.0 allows for a null pointer dereference due to specific EtherNet/IP requests. This could be triggered in the vulnerable EtherNet/IP stack running on the CODESYS Control runtime system.
The Impact of CVE-2021-36765
The exploitation of this vulnerability could result in a denial-of-service condition, where an attacker could potentially crash the system, or in the worst-case scenario, execute arbitrary code remotely.
Technical Details of CVE-2021-36765
Let's explore the technical aspects of CVE-2021-36765 to better understand its implications.
Vulnerability Description
The vulnerability arises from the mishandling of specific EtherNet/IP requests, leading to a null pointer dereference in the EtherNet/IP stack executed by the CODESYS Control runtime system.
Affected Systems and Versions
All versions of CODESYS EtherNetIP before 4.1.0.0 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending crafted EtherNet/IP requests to the vulnerable system, triggering the null pointer dereference and potentially causing a system crash or executing arbitrary code.
Mitigation and Prevention
Discover the steps and practices to mitigate the risks associated with CVE-2021-36765 for enhanced cybersecurity.
Immediate Steps to Take
It is recommended to update CODESYS EtherNetIP to version 4.1.0.0 or newer to patch the vulnerability and prevent exploitation.
Long-Term Security Practices
Implementing network segmentation, access control policies, and regular security updates can enhance the overall security posture of the system.
Patching and Updates
Regularly check for updates from CODESYS and apply patches promptly to address any known security vulnerabilities.