What is CVE-2021-33440?

CVE-2021-33440 is a medium-severity vulnerability in Cesanta Mjs, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-07-26.

How severe is CVE-2021-33440?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-33440 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Cesanta Mjs

CVE-2021-33440

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There is NULL pointer dereference in mjs_bcode_commit() in mjs.c.

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Cesanta Mjs
N/a — versions n/a

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

cve@mitre.org (Exploit, Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-33440?: CVE-2021-33440 is a medium-severity vulnerability in Cesanta Mjs, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-07-26.
How severe is CVE-2021-33440?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-33440 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.