CVE-2021-33438 Memory corruption in n/a
A stack buffer overflow in the mJS JavaScript engine allows attackers to execute arbitrary code or cause 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-2021-33438?
CVE-2021-33438 is a medium-severity memory corruption vulnerability in Cesanta Mjs, published on 26 Jul 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
An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There is stack buffer overflow in json_parse_array() in mjs.c.
Weakness: CWE-787
Which versions are affected by CVE-2021-33438?
It affects 1 product.
Products include Cesanta Mjs.
How do I fix CVE-2021-33438?
No fix has been published for CVE-2021-33438 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-33438 being exploited?
There is no known exploitation of CVE-2021-33438 in the wild and no public exploit code.
Other vulnerabilities in Cesanta Mjs
Sources
Also known as GHSA-j6m5-w993-29q5.