CVE-2020-5665 : What You Need to Know

A vulnerability in the MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier could allow an attacker to trigger a denial-of-service (DoS) condition.

Understanding CVE-2020-5665

This CVE involves an improper handling of exceptional conditions in the affected firmware, leading to potential DoS attacks.

What is CVE-2020-5665?

The vulnerability in the MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier enables attackers to induce a DoS state by sending a specially crafted ARP packet.

The Impact of CVE-2020-5665

The vulnerability allows malicious actors to disrupt program execution and communication, causing a DoS condition on the affected device.

Technical Details of CVE-2020-5665

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw arises from improper handling of exceptional conditions in the firmware, enabling attackers to exploit the device.

Affected Systems and Versions

Product: MELSEC iQ-F series FX5U(C) CPU unit
Vendor: Mitsubishi Electric Corporation
Versions Affected: Firmware version 1.060 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a specially crafted ARP packet to the affected device, triggering the DoS condition.

Mitigation and Prevention

Protecting systems from CVE-2020-5665 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply security patches provided by Mitsubishi Electric Corporation promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any signs of ARP-based attacks.

Long-Term Security Practices

Regularly update firmware and software to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.
Educate users and administrators on best security practices to prevent future incidents.

Patching and Updates

Ensure that all devices running the affected firmware version are updated with the latest patches to remediate the vulnerability.