What is CVE-2021-4043?

CVE-2021-4043 is a medium-severity vulnerability in Gpac, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-02-04.

How severe is CVE-2021-4043?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-4043 known to be exploited?

17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Gpac

CVE-2021-4043

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

Published 2022-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.046 (91.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000

Affected products

Gpac
Gpac Gpac/gpac — versions unspecified
Debian Linux — versions 11.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

huntr.dev/bounties/d7a534cb-df7a-48ba-8ce3-46b1551a9c47 (Exploit, Third Party Advisory, Issue Tracking)
github.com/gpac/gpac/commit/64a2e1b799352ac7d7aad1989bc06e7b0f2b01db (Patch, Third Party Advisory)
www.debian.org/security/2023/dsa-5411 (vendor-advisory, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4043?: CVE-2021-4043 is a medium-severity vulnerability in Gpac, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-02-04.
How severe is CVE-2021-4043?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-4043 known to be exploited?: 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.