Name: CVE-2021-21859: Integer Overflow to Buffer Overflow
Creator: Rapid7
Published: 2021-08-16T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2021-21859, CWE-680, CWE-190, CVSS 8.8, EPSS 0.00609

An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.

CVSS Details

CVSS 3.1 Base Score: 8.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Arch Linux	—	Upgrade to the latest version of Arch Linux	Jul 11, 2025	Aug 16, 2021
Debian	—	Upgrade gpac	Nov 4, 2022	Aug 16, 2021
Gentoo Linux	—	Upgrade media-video/gpac.	Aug 12, 2024	Aug 16, 2021

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CVSS Details

Covered by Rapid7

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