CVE-2021-21835: Gpac

High severity, CVSS 8.8. EPSS: 1.4% chance of exploitation in the next 30 days.

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input when decoding the atom associated with the “csgp” FOURCC can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability.

Affected products

• Gpac Gpac: version 1.0.1 only

Published 2021-08-25. Last modified 2026-06-17.