CVE-2009-0003: Apple Quicktime

High severity, CVSS 9.3. EPSS: 9.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in Apple QuickTime before 7.6 allows remote attackers to cause a denial of service (application termination) and execute arbitrary code via an AVI movie file with an invalid nBlockAlign value in the _WAVEFORMATEX structure.

Affected products

• Apple Quicktime: up to and including 7.5.5; affected versions not specified; version 3.0 only; version 4.1.2 only; version 5.0 only; version 5.0.1 only; …

Published 2009-01-21. Last modified 2026-06-16.