CVE-2021-21961 Explained : Impact and Mitigation

This article provides an in-depth analysis of CVE-2021-21961, a critical stack-based buffer overflow vulnerability found in Sealevel Systems, Inc. SeaConnect 370W v1.3.34, allowing remote code execution.

Understanding CVE-2021-21961

CVE-2021-21961 is a severe vulnerability that exists in the NBNS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34, which can be exploited by an attacker to execute malicious code remotely.

What is CVE-2021-21961?

CVE-2021-21961 is a stack-based buffer overflow vulnerability in the SeaConnect 370W v1.3.34. By sending a specially-crafted network packet, an attacker can trigger this vulnerability and achieve remote code execution.

The Impact of CVE-2021-21961

The impact of CVE-2021-21961 is critical, with a CVSS v3.0 base score of 10 (Critical), posing a high risk to confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-21961

CVE-2021-21961 involves the following technical details:

Vulnerability Description

The vulnerability is a stack-based buffer overflow in the NBNS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34, allowing attackers to remotely execute arbitrary code.

Affected Systems and Versions

Sealevel Systems, Inc. SeaConnect 370W v1.3.34 is affected by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a specially-crafted network packet to the target system, triggering the buffer overflow and potentially gaining unauthorized access.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21961, consider the following steps:

Immediate Steps to Take

Implement network segmentation to limit the exposure of vulnerable systems.
Apply the latest security patches provided by Sealevel Systems.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch all software and firmware components.
Conduct security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Sealevel Systems may release patches or updates to address CVE-2021-21961. It is crucial to promptly apply these patches to secure the affected systems.