What is CVE-2021-31261?

CVE-2021-31261 is a medium-severity vulnerability in Gpac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2021-04-19.

How severe is CVE-2021-31261?

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

Buffer overflow in Gpac

CVE-2021-31261

The gf_hinter_track_new function in GPAC 1.0.1 allows attackers to read memory via a crafted file in the MP4Box command.

Vulnerability class: Buffer Overflow

Published 2021-04-19 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.7th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Gpac — versions 1.0.1

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com/gpac/gpac/issues/1737 (Exploit, Third Party Advisory)
github.com/gpac/gpac/commit/cd3738dea038dbd12e603ad48cd7373ae0440f65 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31261?: CVE-2021-31261 is a medium-severity vulnerability in Gpac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2021-04-19.
How severe is CVE-2021-31261?: Medium severity. CVSS v3 base score is 5.5 out of 10.