VULNERABILITY INTELLIGENCE

CVE-2021-21848

CVSS score8.8 HIGH
EPSS probability1.71%
CISA KEVNot currently listed
Published2021-08-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • talos-cna@cisco.com: CWE-680
  • nvd@nist.gov: CWE-119

Primary references