CVE-2023-33720: mp4v2 v2.1.2 was discovered to contain a memory leak via the class MP4BytesProperty.

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MEDIUM 6.5DOWNGRADE

CVE-2023-33720 is a medium-severity flaw (CVSS 6.5) affecting mp4v2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mp4v2 v2.1.2 was discovered to contain a memory leak via the class MP4BytesProperty.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2023-05-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mp4v2 project

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

Am I affected?

Timeline

2023-05-26 16:15 UTCPublished CVE record published
2026-06-17 06:02 UTCUpdated Record last modified

mp4v2 project mp4v2 DOWNGRADE

Affected: 2.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.2

1. Check installed version

apt-cache policy mp4v2 || rpm -q mp4v2 || mp4v2 --version

2. No fixed release: DOWNGRADE to a release before 2.1.2 (Debian / Ubuntu)

apt-cache madison mp4v2 sudo apt install mp4v2=<VERSION_BEFORE_2.1.2> sudo apt-mark hold mp4v2

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

dnf --showduplicates list mp4v2 sudo dnf downgrade mp4v2-<VERSION_BEFORE_2.1.2> sudo dnf versionlock add mp4v2

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-2023-33720?

mp4v2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-33720 being exploited?

CVE-2023-33720 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-2023-33720 affect?

CVE-2023-33720 affects mp4v2. Severity is medium (CVSS 6.5). mp4v2 v2.1.2 was discovered to contain a memory leak via the class MP4BytesProperty.

How urgent is CVE-2023-33720?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2023-33719 MEDIUM 5.5 DOWNGRADE mp4v2 v2.1.3 was discovered to contain a memory leak via MP4SdpAtom::Read() at atom_sdp.cpp
CVE-2023-33717 MEDIUM 5.5 DOWNGRADE mp4v2 v2.1.3 was discovered to contain a memory leak when a method calling MP4File::ReadBytes() had allocated
CVE-2023-33716 MEDIUM 5.5 DOWNGRADE mp4v2 v2.1.3 was discovered to contain a memory leak via the class MP4StringProperty at mp4property.cpp.
CVE-2023-29584 HIGH 8.8 DOWNGRADE mp4v2 v2.0.0 was discovered to contain a heap buffer overflow via the MP4GetVideoProfileLevel function at /src
CVE-2023-29578 HIGH 8.8 DOWNGRADE mp4v2 v2.0.0 was discovered to contain a heap buffer overflow via the mp4v2::impl::MP4StringProperty::~MP4Stri

References

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