What’s Vulnerable › Vulnerabilities

CVE-2021-21848

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% 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. 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.

Affected products

• Debian Linux: 10.0, 11.0
• GPAC: 1.0.1

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297
• https://www.debian.org/security/2021/dsa-4966
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297
• https://www.debian.org/security/2021/dsa-4966

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