CVE-2021-21971 Explained : Impact and Mitigation

A detailed overview of CVE-2021-21971 highlighting the vulnerability in Sealevel Systems, Inc. SeaConnect 370W v1.3.34, its impact, technical details, and mitigation steps.

Understanding CVE-2021-21971

This section sheds light on the specifics of CVE-2021-21971.

What is CVE-2021-21971?

CVE-2021-21971 pertains to an out-of-bounds write vulnerability in the URL_decode functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. It can be exploited by a specially-crafted MQTT payload, enabling attackers to trigger an out-of-bounds write through a man-in-the-middle attack.

The Impact of CVE-2021-21971

The CVSSv3.0 base score for CVE-2021-21971 is 3.7, categorizing the severity as low. This vulnerability has a high attack complexity and network-based attack vector, with the potential for an out-of-bounds write.

Technical Details of CVE-2021-21971

Explore the technical nuances of CVE-2021-21971 below.

Vulnerability Description

The vulnerability involves an out-of-bounds write within the URL_decode function of Sealevel Systems, Inc. SeaConnect 370W v1.3.34, triggered by a malicious MQTT payload.

Affected Systems and Versions

The affected product is Sealevel's SeaConnect 370W v1.3.34.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting MQTT payloads to perform a man-in-the-middle attack, leading to an out-of-bounds write scenario.

Mitigation and Prevention

Discover the essential steps to mitigate and prevent CVE-2021-21971.

Immediate Steps to Take

Upon detection, organizations should apply relevant security patches promptly and monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implementing network monitoring solutions and regular security audits are crucial for maintaining a robust security posture.

Patching and Updates

Regularly updating software and firmware, along with applying security patches from vendors, is vital in safeguarding systems against known vulnerabilities.