CVE-2021-21002 : Vulnerability Insights and Analysis

A vulnerability has been discovered in Phoenix Contact FL COMSERVER UNI products that can lead to a temporary denial of service. Here's what you need to know about CVE-2021-21002:

Understanding CVE-2021-21002

This section provides an overview of what CVE-2021-21002 entails.

What is CVE-2021-21002?

Phoenix Contact FL COMSERVER UNI products with versions lower than 2.40 are vulnerable to a temporary denial of service due to an invalid Modbus exception response.

The Impact of CVE-2021-21002

The vulnerability poses a high availability impact with a base severity score of 7.5, making it crucial to address to prevent service disruptions.

Technical Details of CVE-2021-21002

Get insights into the technical aspects of CVE-2021-21002 in this section.

Vulnerability Description

The flaw in Phoenix Contact FL COMSERVER UNI products allows attackers to trigger a denial of service through a specific Modbus exception response.

Affected Systems and Versions

Products including FL COMSERVER with versions < 2.40, namely UNI 232/422/485 (2313452) and UNI 232/422/485-T (2904817) are impacted.

Exploitation Mechanism

The vulnerability can be exploited through the network with low attack complexity and doesn't require specific privileges.

Mitigation and Prevention

Learn how to mitigate the risks posed by CVE-2021-21002 in this section.

Immediate Steps to Take

Upgrade to the latest firmware version equal to or greater than 2.41 to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implementing a robust security policy, regular security assessments, and monitoring network traffic can enhance overall cybersecurity.

Patching and Updates

Stay updated with security patches and advisories from Phoenix Contact to address known vulnerabilities effectively.