What is CVE-2021-32135?

CVE-2021-32135 is a medium-severity vulnerability in Gpac, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-09-13.

How severe is CVE-2021-32135?

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

NULL pointer dereference in Gpac

CVE-2021-32135

The trak_box_size function in GPAC 1.0.1 allows attackers to cause a denial of service (NULL pointer dereference) via a crafted file in the MP4Box command.

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: 0.009 (57.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Gpac — versions 1.0.1

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/gpac/gpac/issues/1757 (Exploit, Third Party Advisory)
github.com/gpac/gpac/commit/b8f8b202d4fc23eb0ab4ce71ae96536ca6f5d3f8 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-32135?: CVE-2021-32135 is a medium-severity vulnerability in Gpac, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-09-13.
How severe is CVE-2021-32135?: Medium severity. CVSS v3 base score is 5.5 out of 10.