CVE-2021-37231: A stack-buffer-overflow occurs in Atomicparsley 20210124.204813.840499f through APar_readX() in src/util.cpp w

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MEDIUM 5.5DOWNGRADE

CVE-2021-37231 is a medium-severity flaw (CVSS 5.5) affecting atomicparsley. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-08-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: atomicparsley project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-04 10:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

atomicparsley project atomicparsley DOWNGRADE

Affected: 20210124.204813.840499f

Fixed in: no fixed release known

Safe to downgrade to: a release before 20210124.204813.840499f

1. Check installed version

apt-cache policy atomicparsley || rpm -q atomicparsley || atomicparsley --version

2. No fixed release: DOWNGRADE to a release before 20210124.204813.840499f (Debian / Ubuntu)

apt-cache madison atomicparsley sudo apt install atomicparsley=<VERSION_BEFORE_20210124.204813.840499f> sudo apt-mark hold atomicparsley

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list atomicparsley sudo dnf downgrade atomicparsley-<VERSION_BEFORE_20210124.204813.840499f> sudo dnf versionlock add atomicparsley

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-37231?

atomicparsley: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-37231 being exploited?

CVE-2021-37231 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-37231 affect?

CVE-2021-37231 affects atomicparsley. Severity is medium (CVSS 5.5). 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.

How urgent is CVE-2021-37231?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2021-37232 CRITICAL 9.8 UPGRADE A stack overflow vulnerability occurs in Atomicparsley 20210124.204813.840499f through APar_read64() in src/ut

References

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