CVE-2021-27477 : Vulnerability Insights and Analysis
Discover the impact of CVE-2021-27477, affecting JTEKT Corporation TOYOPUC PLC. Learn about the vulnerability, affected versions, and mitigation steps for enhanced cybersecurity.
A vulnerability in JTEKT Corporation TOYOPUC PLC could allow an attacker to overwrite specific memory buffers, leading to system errors and product malfunction.
Understanding CVE-2021-27477
This CVE impacts various versions of JTEKT Corporation TOYOPUC PLC, causing the affected products to stop functioning when receiving an invalid frame.
What is CVE-2021-27477?
When certain versions of JTEKT Corporation TOYOPUC PLC receive an invalid frame, it results in the outside area of a receive buffer being overwritten. This triggers a system error detected by the PLC CPU, causing the affected products to cease operation.
The Impact of CVE-2021-27477
The vulnerability can be exploited by an attacker to disrupt operations, potentially leading to downtime, system errors, and product malfunction. It poses a significant risk to industrial control systems relying on the affected PLC versions.
Technical Details of CVE-2021-27477
The following technical details outline the vulnerability, affected systems, and exploitation mechanism.
Vulnerability Description
The vulnerability stems from the improper handling of memory buffers within the affected versions of JTEKT Corporation TOYOPUC PLC, allowing for buffer overwrites and system errors.
Affected Systems and Versions
Versions affected include PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, and more. Check the vendor's advisory for a comprehensive list of impacted versions.
Exploitation Mechanism
Exploiting this vulnerability involves sending an invalid frame to the targeted PLC versions, causing the overwrite of specific memory buffers and subsequent system errors.
Mitigation and Prevention
To address CVE-2021-27477, immediate steps, long-term security practices, and patching procedures are crucial.
Immediate Steps to Take
Ensure network security measures are in place, apply vendor patches promptly, and monitor system logs for any unusual activity or errors.
Long-Term Security Practices
Regularly update and patch all PLC devices, implement network segmentation, restrict access to critical systems, and conduct routine security audits.
Patching and Updates
Stay informed about security updates from JTEKT Corporation, apply patches as soon as they are released, and follow best practices to secure your industrial control systems.