CVE-2021-46525 : What You Need to Know

Cesanta MJS v2.20.0 was found to have a heap use-after-free vulnerability via mjs_apply at src/mjs_exec.c.

Understanding CVE-2021-46525

Cesanta MJS v2.20.0 vulnerability details and impact.

What is CVE-2021-46525?

The CVE-2021-46525 vulnerability involves a heap-use-after-free issue in Cesanta MJS v2.20.0 through the mjs_apply function located at src/mjs_exec.c.

The Impact of CVE-2021-46525

The vulnerability can potentially lead to a security breach by allowing an attacker to execute arbitrary code or crash the application.

Technical Details of CVE-2021-46525

Insight into the technical aspects of the CVE.

Vulnerability Description

The vulnerability stems from improper memory handling in Cesanta MJS v2.20.0, specifically within the mjs_apply function.

Affected Systems and Versions

Affected Version: Cesanta MJS v2.20.0

Exploitation Mechanism

The vulnerability can be exploited by a malicious actor to craft a specially designed request, leading to the execution of unintended code.

Mitigation and Prevention

Ways to address and prevent the CVE-2021-46525 vulnerability.

Immediate Steps to Take

Update Cesanta MJS to a patched version or apply vendor-provided fixes promptly.
Monitor security channels for any exploitation reports related to this vulnerability.

Long-Term Security Practices

Conduct regular security assessments and code reviews to identify and address vulnerabilities promptly.
Implement secure coding practices to minimize the risk of future vulnerabilities.

Patching and Updates

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