CVE-2020-5656 Explained : Impact and Mitigation

A vulnerability in the TCP/IP function of MELSEC iQ-R series products allows remote attackers to disrupt network functions or execute malicious code.

Understanding CVE-2020-5656

This CVE involves an improper access control issue in specific modules of the MELSEC iQ-R series.

What is CVE-2020-5656?

The vulnerability in the firmware of MELSEC iQ-R series products enables unauthenticated remote attackers to interfere with network operations or run unauthorized programs through crafted packets.

The Impact of CVE-2020-5656

The vulnerability poses a significant risk as attackers can disrupt critical network functions or execute malicious code without authentication.

Technical Details of CVE-2020-5656

The technical aspects of the CVE provide insights into the affected systems and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper access control in the TCP/IP function of the affected MELSEC iQ-R series modules.

Affected Systems and Versions

Product: MELSEC iQ-R series
Vendor: Mitsubishi Electric Corporation
Vulnerable Versions: RJ71EIP91, RJ71PN92, RD81DL96, RD81MES96N, RD81OPC96

Exploitation Mechanism

Attackers can exploit this vulnerability remotely by sending specially crafted packets to the affected modules.

Mitigation and Prevention

Protecting systems from CVE-2020-5656 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply patches provided by Mitsubishi Electric Corporation promptly.
Implement network segmentation to limit exposure to potential attacks.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and mitigate potential risks.

Patching and Updates

Stay informed about security advisories from the vendor.
Apply security patches and updates as soon as they are released to ensure system protection.