What is CVE-2023-4721?

CVE-2023-4721 is a medium-severity vulnerability in Gpac, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2023-09-01.

How severe is CVE-2023-4721?

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

Out-of-bounds Read in Gpac

CVE-2023-4721

Out-of-bounds Read in GitHub repository gpac/gpac prior to 2.3-DEV.

Vulnerability class: Buffer Overflow

Published 2023-09-01 · 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: 0.003 (20.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Gpac
Gpac Gpac/gpac — versions unspecified

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

huntr.dev/bounties/f457dc62-3cff-47bd-8fd2-1cb2b4a832fc (Exploit, Patch, Third Party Advisory)
github.com/gpac/gpac/commit/3ec93d73d048ed7b46fe6e9f307cc7a0cc13db63 (Patch)

Frequently asked questions

What is CVE-2023-4721?: CVE-2023-4721 is a medium-severity vulnerability in Gpac, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2023-09-01.
How severe is CVE-2023-4721?: Medium severity. CVSS v3 base score is 5.5 out of 10.