CVE-2020-5527 : Vulnerability Insights and Analysis

This CVE involves a vulnerability in the MELSOFT transmission port (UDP/IP) of multiple Mitsubishi Electric MELSEC series, potentially leading to a denial-of-service (DoS) condition.

Understanding CVE-2020-5527

This vulnerability affects various Mitsubishi Electric MELSEC series when receiving a large amount of data through the MELSOFT transmission port, causing resource consumption issues and improper data processing.

What is CVE-2020-5527?

When the MELSOFT transmission port of Mitsubishi Electric MELSEC series receives excessive data via unspecified vectors, it can lead to a denial-of-service (DoS) condition due to resource consumption and data processing failures.

The Impact of CVE-2020-5527

The vulnerability can result in a denial-of-service (DoS) condition, affecting the Ethernet communication functions of the impacted Mitsubishi Electric MELSEC series.

Technical Details of CVE-2020-5527

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability occurs in the MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series, iQ-F series, Q series, L series, and F series when overwhelmed with data, leading to resource consumption and data processing issues.

Affected Systems and Versions

MELSEC iQ-R series (all versions)
MELSEC iQ-F series (all versions)
MELSEC Q series (all versions)
MELSEC L series (all versions)
MELSEC F series (all versions)

Exploitation Mechanism

The vulnerability is exploited by sending a massive amount of data through the MELSOFT transmission port via unspecified vectors, causing resource exhaustion and data processing failures.

Mitigation and Prevention

To address CVE-2020-5527, follow these mitigation strategies:

Immediate Steps to Take

Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any unusual patterns that may indicate a DoS attempt.
Apply firewall rules to restrict access to vulnerable ports.

Long-Term Security Practices

Regularly update and patch the affected Mitsubishi Electric MELSEC series to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Stay informed about security advisories from Mitsubishi Electric Corporation and apply patches promptly to secure the systems.