What is CVE-2021-46342?

CVE-2021-46342 is a medium-severity vulnerability in Jerryscript, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-01-20.

How severe is CVE-2021-46342?

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

Vulnerability in Jerryscript

CVE-2021-46342

There is an Assertion 'ecma_is_lexical_environment (obj_p) || !ecma_op_object_is_fast_array (obj_p)' failed at /jerry-core/ecma/base/ecma-helpers.c in JerryScript 3.0.0.

Published 2022-01-20 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.006 (47.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Jerryscript — versions 3.0.0

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/jerryscript-project/jerryscript/issues/4934 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-46342?: CVE-2021-46342 is a medium-severity vulnerability in Jerryscript, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-01-20.
How severe is CVE-2021-46342?: Medium severity. CVSS v3 base score is 5.5 out of 10.