How severe is CVE-2021-35307?

CVE-2021-35307 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-35307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35307?

CVE-2021-35307 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35307?

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

When was CVE-2021-35307 published?

CVE-2021-35307 was published on 2021-08-05 and last updated on 2026-06-17.

CVE-2021-35307

CVE-2021-35307 is a medium-severity vulnerability in Axiosys Bento4 with a CVSS 3.x base score of 6.5. 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 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Axiosys Bento4
Published: 2021-08-05
Last modified: 2026-06-17

Description

An issue was discovered in Bento4 through v1.6.0-636. A NULL pointer dereference exists in the AP4_DescriptorFinder::Test component located in /Core/Ap4Descriptor.h. It allows an attacker to cause a denial of service (DOS).

Frequently asked questions

What is CVE-2021-35307?: An issue was discovered in Bento4 through v1.6.0-636. A NULL pointer dereference exists in the AP4_DescriptorFinder::Test component located in /Core/Ap4Descriptor.h. It allows an attacker to cause a denial of service (DOS).
How severe is CVE-2021-35307?: CVE-2021-35307 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-35307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35307?: CVE-2021-35307 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35307 published?: CVE-2021-35307 was published on 2021-08-05 and last updated on 2026-06-17.

References

https://github.com/axiomatic-systems/Bento4/issues/616

Affected products (1)

cpe:2.3:a:axiosys:bento4:*:*:*:*:*:*:*:*

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