A stack-buffer-overflow occurs in Atomicparsley 20210124.204813.840499f through APar_readX() in src/util.cpp while parsing a crafted mp4 fi…

published 2021-08-04 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-23803

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

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.

Patch / fix

distros 2 links 2

debian arch linux

atomicparsley Debian 14, Debian 13, Debian 12 20210715.151551.e7ad03a-1

debian advisories DEBIAN-CVE-2021-37231

atomicparsley Arch Linux 20210715.151551.e7ad03a-1

arch linux advisories AVG-2253

github.com/wez/atomicparsley#31 pull request
github.com/wez/atomicparsley/issues/30 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37231 updated 2025-11-21 cvss 5.5

AtomicParsley: stack-based buffer overflow because of the missing boundary check while parsing a crafted mp4 file

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/wez/atomicparsley/issues/30 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /wez/atomicparsley/pull/31#issue-687280335
third-party-advisory
github.com /wez/atomicparsley/issues/30
exploit, patch, third-party-advisory
security.gentoo.org /glsa/202305-01
vendor-advisory

Sources

CVE List CVE-2021-37231
NVD CVE-2021-37231

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary