CVE-2021-21962 : Vulnerability Insights and Analysis

A heap-based buffer overflow vulnerability was discovered in the OTA Update u-download functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. This vulnerability could allow remote code execution by sending specially-crafted MQTT payloads. An attacker would need to carry out a man-in-the-middle attack to exploit this flaw.

Understanding CVE-2021-21962

This section provides detailed insights into the CVE-2021-21962 vulnerability.

What is CVE-2021-21962?

The CVE-2021-21962 is a heap-based buffer overflow vulnerability found in Sealevel Systems, Inc. SeaConnect 370W v1.3.34, which could potentially lead to remote code execution through crafted MQTT payloads.

The Impact of CVE-2021-21962

With a CVSS base score of 9 out of 10 and a critical severity level, this vulnerability has a high impact on confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-21962

This section delves into the technical aspects of CVE-2021-21962.

Vulnerability Description

The vulnerability arises due to a heap-based buffer overflow in the OTA Update u-download feature of Sealevel Systems, Inc. SeaConnect 370W v1.3.34.

Affected Systems and Versions

The impacted product is Sealevel, particularly the SeaConnect 370W v1.3.34 version.

Exploitation Mechanism

Exploiting the vulnerability requires the attacker to send specially-crafted MQTT payloads and execute a man-in-the-middle attack to achieve remote code execution.

Mitigation and Prevention

In this section, we discuss how to mitigate the risks associated with CVE-2021-21962.

Immediate Steps to Take

Users are advised to apply the latest patches provided by Sealevel Systems to address the vulnerability.
Implement network segmentation and proper access controls to limit exposure.

Long-Term Security Practices

Regularly monitor network traffic for any suspicious activities that may indicate an attack.
Conduct security assessments and penetration testing to identify and address potential vulnerabilities.

Patching and Updates

Stay informed about security advisories from Sealevel Systems and promptly apply security patches to ensure systems are protected against known vulnerabilities.