CVE-2021-21846

Multiple exploitable integer overflow vulnerabilities exist within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input in “stsz” decoder 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, Technical Description, Third Party Advisory
• https://www.debian.org/security/2021/dsa-4966Third Party Advisory
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1297Exploit, Technical Description, Third Party Advisory
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297Exploit, Technical Description, Third Party Advisory
• https://www.debian.org/security/2021/dsa-4966Third Party Advisory
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1297Exploit, Technical Description, Third Party Advisory

Published

Aug 18, 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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-21840An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-21841An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-21842An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-21843Multiple exploitable integer overflow vulnerabilities exist …8.8
• CVE-2021-21844Multiple exploitable integer overflow vulnerabilities exist …8.8
• CVE-2021-21845Multiple exploitable integer overflow vulnerabilities exist …8.8
• CVE-2021-21847Multiple exploitable integer overflow vulnerabilities exist …8.8
• CVE-2021-21848An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-21849An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-2185Vulnerability in the Oracle iStore product of Oracle E-Busin…8.2
• CVE-2021-21850An exploitable integer overflow vulnerability exists within …8.8
• CVE-2021-21851Multiple exploitable integer overflow vulnerabilities exist …8.8