How severe is CVE-2021-40943?

CVE-2021-40943 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-40943 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40943?

CVE-2021-40943 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40943?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40943 published?

CVE-2021-40943 was published on 2022-06-28 and last updated on 2026-06-17.

CVE-2021-40943

CVE-2021-40943 is a medium-severity vulnerability in Axiosys Bento4 with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Axiosys Bento4
Published: 2022-06-28
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is 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).
How severe is CVE-2021-40943?: CVE-2021-40943 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-40943 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40943?: CVE-2021-40943 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40943?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40943 published?: CVE-2021-40943 was published on 2022-06-28 and last updated on 2026-06-17.

References

https://github.com/axiomatic-systems/Bento4/issues/643

Affected products (1)

cpe:2.3:a:axiosys:bento4:1.6.0-638:*:*:*:*:*:*:*

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