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CVE-2009-1537

High 8.8 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Microsoft DirectX NULL Byte Overwrite Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

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."

Metrics

CVSS 3.1
8.8 (HIGH) Score source: CNA CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — exploit probability
51% (percentile: 99) as of 1 November 2026
CWE
CWE-158

Affected products

microsoft: directx; microsoft: windows 2000; microsoft: windows 2003 server; microsoft: windows server 2003; microsoft: windows xp

References