What’s Vulnerable › Vulnerabilities

CVE-2021-21835

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-25 · updated 2026-06-17
• Weakness: CWE-680

Description

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input when decoding the atom associated with the “csgp” FOURCC 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.

Affected products

• GPAC: 1.0.1

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297

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