CVE-2018-14403: MP4NameFirstMatches in mp4util.cpp in MP4v2 2.0.0 mishandles substrings of atom names, leading to use of an in

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-14403 is a critical-severity flaw (CVSS 9.8) affecting mp4v2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MP4NameFirstMatches in mp4util.cpp in MP4v2 2.0.0 mishandles substrings of atom names, leading to use of an inappropriate data type for associated atoms. The resulting type confusion can cause out-of-bounds memory access.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-704
Published	2018-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: techsmith

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

Am I affected?

Timeline

2018-07-19 05:29 UTCPublished CVE record published
2026-06-17 01:40 UTCUpdated Record last modified

techsmith mp4v2 DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison mp4v2 sudo apt install mp4v2=<VERSION_BEFORE_2.0.0> sudo apt-mark hold mp4v2

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

dnf --showduplicates list mp4v2 sudo dnf downgrade mp4v2-<VERSION_BEFORE_2.0.0> 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-2018-14403?

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

Is CVE-2018-14403 being exploited?

CVE-2018-14403 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-2018-14403 affect?

CVE-2018-14403 affects mp4v2. Severity is critical (CVSS 9.8). MP4NameFirstMatches in mp4util.cpp in MP4v2 2.0.0 mishandles substrings of atom names, leading to use of an inappropriate data type for associated atoms. The resulting type confusion can cause out-of-bounds memory access.

How urgent is CVE-2018-14403?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-33720 MEDIUM 6.5 DOWNGRADE mp4v2 v2.1.2 was discovered to contain a memory leak via the class MP4BytesProperty.
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

References

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