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

criticalknown exploitedCVE-2009-1537
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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

vendor: Microsoftproduct: DirectXRemote code execution
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-05-20
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2009-1537

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2009-1537coverage & exploitation statusNVD · CVE.org

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