CVE-2021-46520 : What You Need to Know

Cesanta MJS v2.20.0 has been found to have a heap buffer overflow vulnerability via mjs_jprintf at src/mjs_util.c.

Understanding CVE-2021-46520

This CVE identifies a specific vulnerability in Cesanta MJS v2.20.0.

What is CVE-2021-46520?

Cesanta MJS v2.20.0 is affected by a heap buffer overflow through the function mjs_jprintf at src/mjs_util.c.

The Impact of CVE-2021-46520

This vulnerability could potentially allow attackers to execute arbitrary code or cause a denial of service by exploiting the heap buffer overflow.

Technical Details of CVE-2021-46520

Detailed technical information about the vulnerability.

Vulnerability Description

The heap buffer overflow exists in Cesanta MJS v2.20.0 via mjs_jprintf function at src/mjs_util.c.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by crafting specific input to trigger the heap buffer overflow.

Mitigation and Prevention

Ways to mitigate and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update Cesanta MJS to a non-vulnerable version if available.
Apply security patches provided by the vendor.
Monitor for any suspicious activity that could indicate exploitation.

Long-Term Security Practices

Implement code reviews to catch potential vulnerabilities early.
Regularly update software to apply security fixes and enhancements.
Conduct security training for developers to ensure secure coding practices.

Patching and Updates

Stay informed about security updates and patches released by Cesanta to address this vulnerability.