CVE-2021-40566

A Segmentation fault casued by heap use after free vulnerability exists in Gpac through 1.0.1 via...

5.5 MediumFix available

A Segmentation fault casued by heap use after free vulnerability exists in Gpac through 1.0.1 via the mpgviddmx_process function in reframe_mpgvid.c when using mp4box, which causes a denial of service.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.89%Up 0.1 points since Jan 13, 2022

What each source reports

NVD Score used 5.5

Record: CVE-2021-40566
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-416
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-40566
Updated: 2026-11-02

EUVDEUVD-2021-27741 No score

Record: EUVD-2021-27741
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5xr9-fwxj-j4r9 5.5

A Segmentation fault casued by heap use after free vulnerability exists in Gpac through 1.0.1 via...

Record: GHSA-5xr9-fwxj-j4r9
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-416
Updated: 2026-11-02

OSV 5.5

Record: CVE-2021-40566
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-40566 5.5

Record: DEBIAN-CVE-2021-40566
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-40566 5.5

Record: UBUNTU-CVE-2021-40566
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

gpac

Affected packages

Affected packages
Package	Affected	Fixed
`gpac` Debian:11	before 1.0.1+dfsg1-4+deb11u2, plus listed versions 1.0.1+dfsg1-41.0.1+dfsg1-4+deb11u1	1.0.1+dfsg1-4+deb11u2
`gpac` Debian:11 From an advisory covering 106 CVEs	before 1.0.1+dfsg1-4+deb11u2, plus listed versions 1.0.1+dfsg1-41.0.1+dfsg1-4+deb11u1	1.0.1+dfsg1-4+deb11u2
`gpac` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 0.5.0+svn4288~dfsg1-1ubuntu10.5.0+svn4288~dfsg1-40.5.0+svn4288~dfsg1-4ubuntu10.5.0+svn4288~dfsg1-4ubuntu1+esm10.5.0+svn4288~dfsg1-4ubuntu1+esm2	None known
`gpac` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-1build10.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.10.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1+esm2	None known
`gpac` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-30.5.2-426-gc5ad4e4+dfsg5-3ubuntu0.10.5.2-426-gc5ad4e4+dfsg5-3ubuntu0.1+esm1	None known
`gpac` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-4ubuntu10.5.2-426-gc5ad4e4+dfsg5-50.5.2-426-gc5ad4e4+dfsg5-5ubuntu0.1~esm2	None known
`gpac` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1.0.1+dfsg1-41.0.1+dfsg1-52.0.0+dfsg1-22.0.0+dfsg1-2ubuntu0.1~esm2	None known
`gpac` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 2.2.1+dfsg1-32.2.1+dfsg1-3.12.2.1+dfsg1-3.1build12.2.1+dfsg1-3.1build22.2.1+dfsg1-3.1ubuntu0.1~esm2	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-40566 is a medium vulnerability (CVSS 5.5) in Gpac, published January 12, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.89%, the 59th percentile. Fixed in gpac 1.0.1+dfsg1-4+deb11u2.