What is CVE-2019-16366?

CVE-2019-16366 is a critical-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-09-16.

How severe is CVE-2019-16366?

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

Buffer overflow in Moddable

CVE-2019-16366

In XS 9.0.0 in Moddable SDK OS180329, there is a heap-based buffer overflow in fxBeginHost in xsAPI.c when called from fxRunDefine in xsRun.c, as demonstrated by crafted JavaScript code to xst.

Vulnerability class: Buffer Overflow

Published 2019-09-16 · 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: 0.014 (70.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Moddable — versions os180329
Moddable Xs — versions 9.0.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/Moddable-OpenSource/moddable/issues/235 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2019-16366?: CVE-2019-16366 is a critical-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-09-16.
How severe is CVE-2019-16366?: Critical severity. CVSS v3 base score is 9.8 out of 10.