What is CVE-2021-40943?

CVE-2021-40943 is a medium-severity vulnerability in Axiosys Bento4, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-06-28.

How severe is CVE-2021-40943?

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

NULL pointer dereference in Axiosys Bento4

CVE-2021-40943

In Bento4 1.6.0-638, there is a null pointer reference in the function AP4_DescriptorListInspector::Action function in Ap4Descriptor.h:124 , as demonstrated by GPAC. This can cause a denial of service (DOS).

Published 2022-06-28 · 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: 0.006 (46.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Axiosys Bento4 — versions 1.6.0-638

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/axiomatic-systems/Bento4/issues/643 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40943?: CVE-2021-40943 is a medium-severity vulnerability in Axiosys Bento4, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-06-28.
How severe is CVE-2021-40943?: Medium severity. CVSS v3 base score is 5.5 out of 10.