CVE-2021-27498 : Security Advisory and Response

A detailed overview of CVE-2021-27498, including its impact, technical details, and mitigation strategies.

Understanding CVE-2021-27498

In this section, we will explore the specifics of CVE-2021-27498.

What is CVE-2021-27498?

The CVE-2021-27498 vulnerability affects the OpENer EtherNet/IP by EIPStackGroup, specifically versions prior to Feb 10, 2021. It allows an attacker to cause a denial-of-service condition by sending a specially crafted packet.

The Impact of CVE-2021-27498

This vulnerability has a CVSS base score of 7.5, which indicates a high severity level. The attack complexity is low, but the availability impact is high, potentially leading to service disruption.

Technical Details of CVE-2021-27498

Delving into the technical aspects of CVE-2021-27498.

Vulnerability Description

The vulnerability arises due to a reachable assertion issue in the OpENer EtherNet/IP software. Attackers can exploit this to trigger a denial-of-service situation.

Affected Systems and Versions

OpENer EtherNet/IP versions before Feb 10, 2021 are vulnerable to this issue, emphasizing the importance of updating to the latest versions.

Exploitation Mechanism

By sending a maliciously crafted packet to the target system running the vulnerable software, attackers can exploit this vulnerability.

Mitigation and Prevention

Guidelines to mitigate the risks posed by CVE-2021-27498.

Immediate Steps to Take

It is crucial for affected users to apply the latest patches provided by OpENer to address the vulnerability promptly.

Long-Term Security Practices

Implementing network segmentation, access controls, and regular security assessments can enhance overall security posture.

Patching and Updates

Regularly updating software and firmware, along with monitoring security advisories, is essential to prevent exploitation of known vulnerabilities.