CVE-2021-4043: NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.

Q: How do I fix CVE-2021-4043?

gpac: upgrade to 1.1.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-4043 being exploited?

CVE-2021-4043 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4043 affect?

CVE-2021-4043 affects gpac, debian linux. Severity is medium (CVSS 5.5). NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.

Q: How urgent is CVE-2021-4043?

Priority 52/100. EPSS top 8%: very likely to be exploited; Public exploit reference; On your watchlist

This month

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2021-4043 is a medium-severity flaw (CVSS 5.5) affecting gpac, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-476
Published	2022-02-04
Last modified	2026-11-03

Publisher (CNA): huntr.dev · Vendor: debian · gpac

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-04 23:15 UTCPublished CVE record published
2026-11-03 22:17 UTCUpdated Record last modified

gpac gpac UPGRADE

Affected: < 1.1.0

Fixed in: 1.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gpac

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gpac

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-4043?

gpac: upgrade to 1.1.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-4043 being exploited?

CVE-2021-4043 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-2021-4043 affect?

CVE-2021-4043 affects gpac, debian linux. Severity is medium (CVSS 5.5). NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.

How urgent is CVE-2021-4043?

Priority 52/100. EPSS top 8%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

GitHub vulnerabilities · Debian vulnerabilities

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References

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