How severe is CVE-2021-32265?

CVE-2021-32265 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-32265 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32265?

CVE-2021-32265 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32265?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-32265 published?

CVE-2021-32265 was published on 2021-09-20 and last updated on 2026-06-17.

CVE-2021-32265

CVE-2021-32265 is a high-severity vulnerability in Axiosys Bento4 with a CVSS 3.x base score of 8.8. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Axiosys Bento4
Published: 2021-09-20
Last modified: 2026-06-17

Description

An issue was discovered in Bento4 through v1.6.0-637. A global-buffer-overflow exists in the function AP4_MemoryByteStream::WritePartial() located in Ap4ByteStream.cpp. It allows an attacker to cause code execution or information disclosure.

Frequently asked questions

What is CVE-2021-32265?: An issue was discovered in Bento4 through v1.6.0-637. A global-buffer-overflow exists in the function AP4_MemoryByteStream::WritePartial() located in Ap4ByteStream.cpp. It allows an attacker to cause code execution or information disclosure.
How severe is CVE-2021-32265?: CVE-2021-32265 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-32265 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32265?: CVE-2021-32265 affects Axiosys Bento4. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32265?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-32265 published?: CVE-2021-32265 was published on 2021-09-20 and last updated on 2026-06-17.

References

https://github.com/axiomatic-systems/Bento4/issues/545

Affected products (1)

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

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