CVE-2021-46521 Explained : Impact and Mitigation

Cesanta MJS v2.20.0 was found to have a global buffer overflow vulnerability via c_vsnprintf at mjs/src/common/str_util.c.

Understanding CVE-2021-46521

Cesanta MJS version 2.20.0 is affected by a global buffer overflow vulnerability.

What is CVE-2021-46521?

Cesanta MJS v2.20.0 contains a vulnerability that could allow an attacker to trigger a buffer overflow by exploiting the c_vsnprintf function.

The Impact of CVE-2021-46521

The vulnerability could be exploited to execute arbitrary code or crash the application, leading to a denial of service (DoS) condition.

Technical Details of CVE-2021-46521

Cesanta MJS v2.20.0 has specific technical aspects that are crucial to understand.

Vulnerability Description

The vulnerability exists in the c_vsnprintf function located at mjs/src/common/str_util.c in Cesanta MJS v2.20.0.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability can be exploited by an attacker to craft malicious input triggering the buffer overflow in the affected function.

Mitigation and Prevention

Taking immediate steps and adopting long-term security practices are crucial to mitigate the impact of CVE-2021-46521.

Immediate Steps to Take

Update Cesanta MJS to a patched version, if available.
Implement input validation to prevent malicious inputs.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Conduct regular security audits and code reviews.
Stay informed about security updates and patches for all software components.
Educate developers on secure coding practices and buffer overflow prevention.

Patching and Updates

Ensure timely application of patches and updates to Cesanta MJS to address the buffer overflow vulnerability.