What is CVE-2023-31920?

CVE-2023-31920 is a medium-severity vulnerability in Jerryscript, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2023-05-12.

How severe is CVE-2023-31920?

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

Is CVE-2023-31920 known to be exploited?

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

Vulnerability in Jerryscript

CVE-2023-31920

Jerryscript 3.0 (commit 05dbbd1) was discovered to contain an Assertion Failure via the vm_loop at jerry-core/vm/vm.c.

Published 2023-05-12 · 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: 0.003 (23.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Jerryscript — versions 3.0.0

Weakness classification (CWE)

CWE-617 — Reachable Assertion

Public proof-of-concept exploits

EJueon/EJueon

References

github.com/jerryscript-project/jerryscript/issues/5070 (Exploit, Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-31920?: CVE-2023-31920 is a medium-severity vulnerability in Jerryscript, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2023-05-12.
How severe is CVE-2023-31920?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2023-31920 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.