What is CVE-2021-32137?

CVE-2021-32137 is a medium-severity vulnerability in Gpac, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-09-13.

How severe is CVE-2021-32137?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Gpac

CVE-2021-32137

Heap buffer overflow in the URL_GetProtocolType function in MP4Box in GPAC 1.0.1 allows attackers to cause a denial of service or execute arbitrary code via a crafted file.

Vulnerability class: Buffer Overflow

Published 2021-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Gpac — versions 1.0.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/gpac/gpac/issues/1766 (Exploit, Third Party Advisory)
github.com/gpac/gpac/commit/328def7d3b93847d64ecb6e9e0399684e57c3eca (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-32137?: CVE-2021-32137 is a medium-severity vulnerability in Gpac, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-09-13.
How severe is CVE-2021-32137?: Medium severity. CVSS v3 base score is 5.5 out of 10.