What is CVE-2021-37231?

CVE-2021-37231 is a medium-severity vulnerability in Atomicparsley Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-08-04.

How severe is CVE-2021-37231?

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

Buffer overflow in Atomicparsley Project

CVE-2021-37231

A stack-buffer-overflow occurs in Atomicparsley 20210124.204813.840499f through APar_readX() in src/util.cpp while parsing a crafted mp4 file because of the missing boundary check.

Vulnerability class: Buffer Overflow

Published 2021-08-04 · 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: 0.010 (61.2th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: -0.000

Affected products

Atomicparsley Project — versions 20210124.204813.840499f

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/wez/atomicparsley/issues/30 (Exploit, Patch, Third Party Advisory)
github.com/wez/atomicparsley/pull/31 (Third Party Advisory)
security.gentoo.org/glsa/202305-01 (vendor-advisory)

Frequently asked questions

What is CVE-2021-37231?: CVE-2021-37231 is a medium-severity vulnerability in Atomicparsley Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-08-04.
How severe is CVE-2021-37231?: Medium severity. CVSS v3 base score is 5.5 out of 10.