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CVE-2021-21856 Details

Description

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 can cause an integer overflow due to unchecked addition 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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1299	CVE	ExploitTechnical DescriptionThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1299	[email protected]	ExploitTechnical DescriptionThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-119	Improper Restriction of Operations within the Bounds of a Memory Buffer	[email protected]
CWE-680	Integer Overflow to Buffer Overflow	[email protected]

Affected Products

Product	Versions
gpac gpac	1.0.1
CPE cpe:2.3:a:gpac:gpac:1.0.1:::::::* Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jul 29, 2022	Modified Analysis	[email protected]
Apr 28, 2022	CVE Modified	[email protected]
Apr 19, 2022	CVE Modified	[email protected]
Aug 24, 2021	Initial Analysis	[email protected]