Known exploited vulnerability
CVE-2009-1537
The short answer
CVE-2009-1537 affects n/a n/a and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-20: attackers are using it, so patch it first.
What it is
Unspecified vulnerability in the QuickTime Movie Parser Filter in quartz.dll in DirectShow in Microsoft DirectX 7.0 through 9.0c on Windows 2000 SP4, Windows XP SP2 and SP3, and Windows Server 2003 SP2 allows remote attackers to execute arbitrary code via a crafted QuickTime media file, as exploited in the wild in May 2009, aka "DirectX NULL Byte Overwrite Vulnerability."
Weakness: CWE-158.
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since May 20, 2026
Federal due date Jun 3, 2026
EPSS, next 30 days
51%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-028 Vendor Advisory
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6237 Broken Link
- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-028 Vendor Advisory
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6237 Broken Link
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-1537 US Government Resource
Questions
Is CVE-2009-1537 being exploited?
Yes. CISA added CVE-2009-1537 to its Known Exploited Vulnerabilities catalog on 2026-05-20, with a federal remediation due date of 2026-06-03.
How do I fix CVE-2009-1537?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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