CVE-2009-1537: Microsoft DirectX NULL Byte Overwrite Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2026-05-20. EPSS: 51.2% chance of exploitation in the next 30 days.

Unspecified vulnerability in the QuickTime Movie Parser Filter in quartz.dll in DirectShow in Microsoft DirectX 7.0 through 9.0c on Windows 2000 SP4, Windows XP SP2 and SP3, and Windows Server 2003 SP2 allows remote attackers to execute arbitrary code via a crafted QuickTime media file, as exploited in the wild in May 2009, aka "DirectX NULL Byte Overwrite Vulnerability."

Affected products

• Microsoft DirectX: version 7.0 only; version 7.0a only; version 7.1 only; version 8.1 only; version 8.1b only; version 9.0 only; …
• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: any version
• Microsoft Windows Server 2003: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2009-05-29. Last modified 2026-06-16.