What is CVE-2021-32265?

CVE-2021-32265 is a high-severity vulnerability in Axiosys Bento4, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2021-09-20.

How severe is CVE-2021-32265?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-32265 known to be exploited?

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

Buffer overflow in Axiosys Bento4

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.

Vulnerability class: Buffer Overflow

Published 2021-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Axiosys Bento4

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

seviezhou/Kraken

References

github.com/axiomatic-systems/Bento4/issues/545 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-32265?: CVE-2021-32265 is a high-severity vulnerability in Axiosys Bento4, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2021-09-20.
How severe is CVE-2021-32265?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-32265 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.