CVE-2021-21848

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and 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.

• CWE-680
• CWE-119

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297Exploit, Third Party Advisory
• https://www.debian.org/security/2021/dsa-4966Third Party Advisory
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297Exploit, Third Party Advisory
• https://www.debian.org/security/2021/dsa-4966Third Party Advisory

Published

Aug 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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