CVE-2021-33440 : What You Need to Know

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There is a NULL pointer dereference in mjs_bcode_commit() in mjs.c.

Understanding CVE-2021-33440

This section provides insights into the nature and impact of the CVE.

What is CVE-2021-33440?

The CVE-2021-33440 pertains to a vulnerability found in mjs (mJS: Restricted JavaScript engine) related to a NULL pointer dereference issue in mjs_bcode_commit() in mjs.c.

The Impact of CVE-2021-33440

The presence of a NULL pointer dereference vulnerability can lead to potential crashes, denial of service (DoS) attacks, or even arbitrary code execution, posing serious security risks.

Technical Details of CVE-2021-33440

This section delves deeper into the technical aspects of the CVE.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the mjs_bcode_commit() function within the mjs.c file.

Affected Systems and Versions

The issue affects instances of mJS (mJS: Restricted JavaScript engine) utilizing ES6 (JavaScript version 6).

Exploitation Mechanism

Exploiting this vulnerability involves crafting a specific input that triggers the NULL pointer dereference flaw in the mjs_bcode_commit() function.

Mitigation and Prevention

Here, we discuss the steps to mitigate and prevent exploitation of CVE-2021-33440.

Immediate Steps to Take

It is recommended to apply patches or updates provided by the vendor to address the vulnerability promptly.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about potential CVEs to enhance overall system security.

Patching and Updates

Ensure that the system is regularly updated with the latest patches and security fixes to prevent exploitation of known vulnerabilities.