CVE-2021-40565

A Segmentation fault caused by a null pointer dereference vulnerability exists in Gpac through 1...

5.5 MediumFix available

A Segmentation fault caused by a null pointer dereference vulnerability exists in Gpac through 1.0.1 via the gf_avc_parse_nalu function in av_parsers.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

0.91%Up 0.1 points since Jan 13, 2022

What each source reports

NVD Score used 5.5

Record: CVE-2021-40565
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-476
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-40565
Updated: 2026-11-02

EUVDEUVD-2021-27740 No score

Record: EUVD-2021-27740
Updated: 2026-11-03

GitHub AdvisoriesGHSA-44hj-f354-82q3 5.5

A Segmentation fault caused by a null pointer dereference vulnerability exists in Gpac through 1...

Record: GHSA-44hj-f354-82q3
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-476
Updated: 2026-11-02

OSV 5.5

Record: CVE-2021-40565
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-2021-40565 5.5

Record: DEBIAN-CVE-2021-40565
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-2021-40565 5.5

Record: UBUNTU-CVE-2021-40565
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-2021-40565 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 0.91%, the 60th percentile. Fixed in gpac 1.0.1+dfsg1-4+deb11u2.