---
id: CVE-2021-4043
title: NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.
summary: NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: gpac
product: gpac
affected:
  - gpac < 1.1.0
  - debian_linux = 11.0
patched:
  - gpac 1.1.0
published: '2022-02-04'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T22:17:08.373'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-4043'
references:
  - url: >-
      https://github.com/gpac/gpac/commit/64a2e1b799352ac7d7aad1989bc06e7b0f2b01db
    label: security@huntr.dev
  - url: 'https://huntr.dev/bounties/d7a534cb-df7a-48ba-8ce3-46b1551a9c47'
    label: security@huntr.dev
  - url: 'https://www.debian.org/security/2023/dsa-5411'
    label: security@huntr.dev
  - url: >-
      https://github.com/gpac/gpac/commit/64a2e1b799352ac7d7aad1989bc06e7b0f2b01db
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://huntr.dev/bounties/d7a534cb-df7a-48ba-8ce3-46b1551a9c47'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5411'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - exploit-available
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-11-08T04:55:08.103313Z'
scores:
  nvd: 5.5
  cna: 5.8
epss: 0.04615
epssPercentile: 0.91741
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/cyberark/PwnKit-Hunter'
  checkedAt: '2026-11-07T17:41:40.236Z'
exploitAvailable: true
ingestedAt: '2026-11-05T06:38:03.552Z'
---

## Overview

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

## Affected

- `gpac < 1.1.0`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `gpac 1.1.0`