CVE-2021-27500 : What You Need to Know
Learn about CVE-2021-27500, a high severity reachable assertion vulnerability in EIPStackGroup OpENer Ethernet/IP impacting versions prior to Feb 10, 2021. Find out about the impact, technical details, and mitigation steps.
This article provides an in-depth analysis of CVE-2021-27500, a vulnerability found in EIPStackGroup OpENer Ethernet/IP, affecting versions prior to Feb 10, 2021.
Understanding CVE-2021-27500
CVE-2021-27500 is a reachable assertion vulnerability in EIPStackGroup OpENer Ethernet/IP that could lead to a denial-of-service condition when exploited by an attacker.
What is CVE-2021-27500?
A specifically crafted packet sent to the affected product could trigger this vulnerability, resulting in a denial-of-service condition. Tal Keren and Sharon Brizinov of Claroty reported this issue to CISA.
The Impact of CVE-2021-27500
The CVSS v3.1 base score of 7.5 indicates a high severity vulnerability with a low attack complexity and network-based attack vector. This vulnerability could have a significant impact on the availability of the affected systems.
Technical Details of CVE-2021-27500
This section delves into the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability arises from a reachable assertion in EIPStackGroup OpENer Ethernet/IP, allowing attackers to cause a denial-of-service condition on impacted systems.
Affected Systems and Versions
OpENer EtherNet/IP versions prior to Feb 10, 2021 are vulnerable to this assertion vulnerability.
Exploitation Mechanism
By sending a specially crafted packet to the target system running the affected versions, an attacker can exploit this vulnerability to trigger a denial-of-service condition.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-27500, consider the following measures:
Immediate Steps to Take
- Apply the latest commits available for OpENer EtherNet/IP.
Long-Term Security Practices
- Regularly update and patch all software and firmware to prevent known vulnerabilities.
- Implement network segmentation and access controls to limit exposure to attacks.
Patching and Updates
Stay informed about security advisories and updates related to EIPStackGroup OpENer EtherNet/IP to apply patches promptly.