What is CVE-2021-29323?

CVE-2021-29323 is a medium-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-11-19.

How severe is CVE-2021-29323?

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

Buffer overflow in Moddable

CVE-2021-29323

OpenSource Moddable v10.5.0 was discovered to contain a heap buffer overflow via the component /modules/network/wifi/esp/modwifi.c.

Vulnerability class: Buffer Overflow

Published 2021-11-19 · 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 (48.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% 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

Moddable — versions 10.5.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/Moddable-OpenSource/moddable/issues/5 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-29323?: CVE-2021-29323 is a medium-severity vulnerability in Moddable, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-11-19.
How severe is CVE-2021-29323?: Medium severity. CVSS v3 base score is 5.5 out of 10.