CVE-2021-27478 : Security Advisory and Response

EIPStackGroup OpENer Ethernet/IP Incorrect Conversion between Numeric Types is a vulnerability that affects OpENer EtherNet/IP commits and versions prior to Feb 10, 2021. An attacker can exploit this issue by sending a specially crafted packet, leading to a denial-of-service condition.

Understanding CVE-2021-27478

This section will provide insight into the nature and impact of the CVE-2021-27478 vulnerability.

What is CVE-2021-27478?

The CVE-2021-27478 vulnerability exists in EIPStackGroup OpENer EtherNet/IP versions before Feb 10, 2021, allowing attackers to trigger a denial-of-service by sending a malicious packet.

The Impact of CVE-2021-27478

With a CVSS base score of 8.2 (high severity), this vulnerability poses a significant risk to affected systems, potentially leading to downtime and service disruption.

Technical Details of CVE-2021-27478

In this section, we will delve deeper into the technical aspects of the CVE-2021-27478 vulnerability.

Vulnerability Description

The vulnerability stems from an incorrect conversion between numeric types in EIPStackGroup OpENer EtherNet/IP, which makes systems susceptible to denial-of-service attacks.

Affected Systems and Versions

OpENer EtherNet/IP commits and versions released before Feb 10, 2021 are impacted by this vulnerability, highlighting the importance of timely updates.

Exploitation Mechanism

By sending a crafted packet to the target system, threat actors can exploit the vulnerability, causing it to enter a denial-of-service state.

Mitigation and Prevention

This section offers guidance on how to mitigate and prevent the CVE-2021-27478 vulnerability.

Immediate Steps to Take

Users are advised to apply the latest commits provided by OpENer to address the security flaw and prevent potential exploitation.

Long-Term Security Practices

Implementing robust security practices, such as network segmentation and access controls, can help bolster the overall security posture.

Patching and Updates

Regularly updating systems, software, and firmware, including OpENer EtherNet/IP, is crucial to staying protected against known vulnerabilities.