CVE-2021-33445 : What You Need to Know

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). The vulnerability involves a NULL pointer dereference in mjs_string_char_code_at() in mjs.c.

Understanding CVE-2021-33445

This section will provide insights into the nature and impact of CVE-2021-33445.

What is CVE-2021-33445?

CVE-2021-33445 identifies a vulnerability in the mJS JavaScript engine that leads to a NULL pointer dereference when accessing a character code.

The Impact of CVE-2021-33445

The impact of this vulnerability is the potential for a denial of service (DoS) attack or arbitrary code execution by exploiting the NULL pointer dereference.

Technical Details of CVE-2021-33445

This section will delve into the technical aspects of the CVE, including affected systems, exploitation mechanisms, and more.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the mjs_string_char_code_at() function in mjs.c, which could be exploited by an attacker.

Affected Systems and Versions

The issue impacts instances running mjs (mJS) with ES6 (JavaScript version 6), although specific product and version details are not disclosed.

Exploitation Mechanism

Exploiting this vulnerability requires crafting malicious inputs to trigger the NULL pointer dereference, potentially leading to DoS or code execution.

Mitigation and Prevention

This section outlines recommended steps to mitigate the risks posed by CVE-2021-33445 and enhance overall security.

Immediate Steps to Take

Users are advised to monitor vendor security advisories for patches and updates addressing this vulnerability. Consider temporary workarounds if official patches are unavailable.

Long-Term Security Practices

Implement secure coding practices, restrict access to vulnerable components, and conduct regular security assessments to detect and address similar vulnerabilities.

Patching and Updates

Apply patches and updates provided by the mJS framework to remediate CVE-2021-33445 and enhance the security posture of affected systems.