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CVE-2021-32976 Explained : Impact and Mitigation

Learn about CVE-2021-32976, a critical stack-based buffer overflow vulnerability in Moxa NPort IAW5000A-I/O Series firmware, allowing remote attackers to execute arbitrary code and launch denial-of-service attacks.

Five buffer overflows in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier may allow a remote attacker to initiate a denial-of-service attack and execute arbitrary code.

Understanding CVE-2021-32976

This CVE refers to a stack-based buffer overflow vulnerability found in Moxa NPort IAW5000A-I/O Series Serial Device Server firmware.

What is CVE-2021-32976?

The CVE-2021-32976 involves five buffer overflows in the firmware's web server, potentially enabling a malicious actor to trigger a denial-of-service attack and execute unauthorized code.

The Impact of CVE-2021-32976

The severity of this CVE is rated as Critical with a base score of 9.8 under CVSS version 3.1. It poses a high risk to confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-32976

This section details the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from stack-based buffer overflows in the web server code, allowing attackers to crash the server and potentially execute arbitrary code.

Affected Systems and Versions

Moxa NPort IAW5000A-I/O series firmware versions equal to or less than 2.2 are impacted by this vulnerability.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending specially crafted requests to the affected web server, leading to a denial-of-service condition and arbitrary code execution.

Mitigation and Prevention

In response to CVE-2021-32976, Moxa has provided the following solutions and recommendations.

Immediate Steps to Take

If you are using the affected firmware version, it is crucial to apply security patches provided by Moxa promptly. Additionally, monitor for any abnormal server behavior for signs of exploitation.

Long-Term Security Practices

Regularly update and patch all firmware and software components in your network infrastructure. Implement network segmentation and access controls to mitigate risks associated with remote attacks.

Patching and Updates

Contact Moxa Technical Support for the latest security patch addressing the CVE-2021-32976 vulnerability. Refer to Moxa's security advisory for comprehensive guidance on safeguarding your systems.

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