CVE entry · CVE-2009-1537
CVE-2009-1537: 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.
- Actively exploited: added to CISA’s KEV catalog on May 20, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 3, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Microsoft DirectX, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (learn.microsoft.com)
- NVD entry (NIST)
- CISA KEV catalog
Other Microsoft vulnerabilities
-
Microsoft Windows Command Injection Vulnerability
-
Microsoft SharePoint Code Injection Vulnerability
-
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
-
Microsoft Windows Link Following Vulnerability
-
Microsoft SQL Server Remote Code Execution Vulnerability
-
Microsoft SharePoint Weak Authentication Vulnerability