Risk Letters

Exploited vulnerability

CVE-2009-1537

TLP:CLEAR

Microsoft DirectX NULL Byte Overwrite Vulnerability

Microsoft DirectX contains a NULL byte overwrite vulnerability in the QuickTime Movie Parser Filter in quartz.dll in DirectShow which could allow remote attackers to execute arbitrary code via a crafted QuickTime media file.

Facts

  • Vendor: Microsoft
  • Product: DirectX
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 51.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 20 May 2026
  • First known exploitation: 20 May 2026
  • CISA's deadline for US federal agencies: 3 June 2026
  • First seen by Risk Letters: 20 May 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD