Buffer overflow in Cesanta Mjs

CVE-2021-46523

Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via to_json_or_debug at mjs/src/mjs_json.c.

Vulnerability class: Buffer Overflow

EPSS: 0.007 (50.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Cesanta Mjs — versions 2.20.0
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2021-46523?: CVE-2021-46523 is a high-severity vulnerability in Cesanta Mjs, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-01-27.
How severe is CVE-2021-46523?: High severity. CVSS v3 base score is 7.8 out of 10.