What is CVE-2021-41459?

CVE-2021-41459 is a high-severity vulnerability in Gpac Mp4box, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-10-01.

How severe is CVE-2021-41459?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-41459 known to be exploited?

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

Buffer overflow in Gpac Mp4box

CVE-2021-41459

There is a stack buffer overflow in MP4Box v1.0.1 at src/filters/dmx_nhml.c:1008 in the nhmldmx_send_sample() function szXmlFrom parameter which leads to a denial of service vulnerability.

Vulnerability class: Buffer Overflow

Published 2021-10-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Gpac Mp4box — versions 1.0.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

almkuznetsov/sast-labs

References

github.com/gpac/gpac/issues/1912 (Exploit, Third Party Advisory, Issue Tracking)
www.debian.org/security/2023/dsa-5411 (vendor-advisory)

Frequently asked questions

What is CVE-2021-41459?: CVE-2021-41459 is a high-severity vulnerability in Gpac Mp4box, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-10-01.
How severe is CVE-2021-41459?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-41459 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.