CVE-2021-46509 Denial of service in n/a

High 7.8 Published 27 Jan 2022 Updated 4 Aug 2024

A stack overflow in the Cesanta MJS library allows attackers to cause a denial of service via crafted JSON input.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-46509?

CVE-2021-46509 is a high-severity denial of service vulnerability in Cesanta Mjs, published on 27 Jan 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Cesanta MJS v2.20.0 was discovered to contain a stack overflow via snquote at mjs/src/mjs_json.c.

Weakness: CWE-674

Which versions are affected by CVE-2021-46509?

It affects 1 product.

Products include Cesanta Mjs.

How do I fix CVE-2021-46509?

No fix has been published for CVE-2021-46509 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-46509 being exploited?

There is no known exploitation of CVE-2021-46509 in the wild and no public exploit code.

All Cesanta Mjs vulnerabilities

Sources

Also known as GHSA-c8mf-xmr4-fx64.