CVE-2009-1537
Actively exploited. CVE-2009-1537 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-20) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- Microsoft DirectX contains a NULL byte overwrite vulnerability that could allow remote attackers to execute arbitrary code via a crafted QuickTime media file.
- Who is affected
- Users of Microsoft DirectX.
- Urgency
- Immediate remediation is necessary due to the critical nature of the vulnerability and active exploitation.
- Action
- Users should update DirectX to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2009-1537: Microsoft DirectX NULL Byte Overwrite Vulnerabilitycisa-kev · 2026-05-20
External references
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