CVE-2021-21970 : What You Need to Know

An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34, which could lead to a possible out-of-bounds write due to improper handling of data sizes.

Understanding CVE-2021-21970

This CVE identifies a vulnerability in Sealevel Systems, Inc. SeaConnect 370W v1.3.34 that could allow an attacker to trigger an out-of-bounds write exploit.

What is CVE-2021-21970?

The vulnerability in the HandleSeaCloudMessage function allows an attacker to potentially write beyond the allocated buffer size, leading to a security risk.

The Impact of CVE-2021-21970

With a CVSS base score of 3.7, this vulnerability has a low severity that could be exploited under certain conditions, affecting integrity but not confidentiality.

Technical Details of CVE-2021-21970

This section dives deeper into the technical aspects of the vulnerability.

Vulnerability Description

The HandleSeaCloudMessage function fails to adequately check the size of incoming data, allowing data to be written beyond the allocated buffer size, creating a potential security hole.

Affected Systems and Versions

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

Exploitation Mechanism

By sending specially crafted MQTT messages larger than the allocated buffer size, an attacker could trigger the out-of-bounds write vulnerability.

Mitigation and Prevention

To address CVE-2021-21970, immediate action and long-term security practices are recommended.

Immediate Steps to Take

Implementing filters to ensure data size integrity and monitoring incoming MQTT messages can help mitigate the risk.

Long-Term Security Practices

Regularly updating software and maintaining strict data size validation practices can prevent similar vulnerabilities in the future.

Patching and Updates

Vendor patches and updates addressing the out-of-bounds write vulnerability should be promptly applied.