What is CVE-2020-25462?

CVE-2020-25462 is a critical-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-12-04.

How severe is CVE-2020-25462?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Moddable

CVE-2020-25462

Heap buffer overflow in the fxCheckArrowFunction function at moddable/xs/sources/xsSyntaxical.c:3562 in Moddable SDK before OS200903.

Vulnerability class: Buffer Overflow

Published 2020-12-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Moddable

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/Moddable-OpenSource/moddable/issues/432 (Exploit, Third Party Advisory)
github.com/Moddable-OpenSource/moddable/releases/tag/OS200903 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2020-25462?: CVE-2020-25462 is a critical-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-12-04.
How severe is CVE-2020-25462?: Critical severity. CVSS v3 base score is 9.8 out of 10.