CVE-2009-1537VulnerabilityPublished 05/20/2026Updated 10/24/2026
CVE-2009-1537: Microsoft DirectX NULL Byte Overwrite Vulnerability
Affects Microsoft DirectXSource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 05/20/2026
- KEV deadline
- 06/03/2026
- EPSS
- 51.4% chance of exploitation in 30 days – higher than 98% of CVEs
What to do
CISA 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
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.