CVE-2021-46527 : Vulnerability Insights and Analysis

Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_get_cstring at src/mjs_string.c.

Understanding CVE-2021-46527

Cesanta MJS v2.20.0 has a heap buffer overflow vulnerability.

What is CVE-2021-46527?

The vulnerability exists in Cesanta MJS v2.20.0 due to a heap buffer overflow in the function mjs_get_cstring located at src/mjs_string.c.

The Impact of CVE-2021-46527

This vulnerability can be exploited to execute arbitrary code by an attacker, potentially leading to a denial of service or remote code execution.

Technical Details of CVE-2021-46527

Cesanta MJS v2.20.0 vulnerability details.

Vulnerability Description

A heap buffer overflow was found in the function mjs_get_cstring in the source file mjs_string.c of Cesanta MJS v2.20.0, allowing attackers to manipulate memory.

Affected Systems and Versions

Affected version: Cesanta MJS v2.20.0

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious input that triggers the overflow, potentially leading to arbitrary code execution.

Mitigation and Prevention

Measures to address CVE-2021-46527.

Immediate Steps to Take

Update Cesanta MJS to a patched version that addresses the heap buffer overflow.
Monitor for any unusual activities on the system that could indicate exploitation.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflow vulnerabilities.
Regularly update and patch software to mitigate known security issues.

Patching and Updates

Ensure regular updates and patches for Cesanta MJS to stay protected against security vulnerabilities.