What it is
CVE-2009-1537 is an unauthenticated vulnerability affecting Microsoft DirectX.
Vulnerability report
Trusted Third Party Report
Confirmed Confidence
In CISA KEV
CVE-2009-1537
DirectX
Microsoft / DirectX
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Trusted Third Party Report
- EPSS
- 51.1%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Have exploitation attempts been observed?
Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.
Who is affected?
Microsoft / DirectX.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
DirectX
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."
- Published
- 29 May 2009
- Exploitation Attempts Reported
- 29 May 2009
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
Tags
cisa
windows
microsoft
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2009-1537
- MS09-028 docs.microsoft.com · Vendor Advisory https://docs.microsoft.com/en-us/security-updates/securitybulletins/2...
- 35268 secunia.com · Third-Party Advisory http://secunia.com/advisories/35268
- TA09-195A us-cert.gov · Third-Party Advisory http://www.us-cert.gov/cas/techalerts/TA09-195A.html
- oval:org.mitre.oval:def:6237 oval.cisecurity.org · VDB Entry https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.m...
- 1022299 securitytracker.com · VDB Entry http://www.securitytracker.com/id?1022299
- ADV-2009-1886 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2009/1886
- ADV-2009-1445 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2009/1445
- 54797 osvdb.org · VDB Entry http://osvdb.org/54797
- 35139 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/35139
- blogs.technet.com/srd/archive/2009/05/28/new-vulnerability-in-... blogs.technet.com · CVE Record http://blogs.technet.com/srd/archive/2009/05/28/new-vulnerability-in-...
- isc.sans.org/diary.html isc.sans.org · CVE Record http://isc.sans.org/diary.html?storyid=6481
- microsoft.com/technet/security/advisory/971778.mspx microsoft.com · CVE Record http://www.microsoft.com/technet/security/advisory/971778.mspx
- blogs.technet.com/msrc/archive/2009/05/28/microsoft-security-a... blogs.technet.com · CVE Record http://blogs.technet.com/msrc/archive/2009/05/28/microsoft-security-a...
Exploitation evidence
Evidence of exploitation attempts
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploitation Attempts Observed in the Wild
CVE
A trusted third party reported exploitation attempts.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2009-05-29 18:00 UTC |
| CISA | 2026-06-02 14:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.8
High
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
51.1%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
All CVSS Scores
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0
9.3
High
AV:N/AC:M/Au:N/C:C/I:C/A:C
Timeline
From disclosure to observed exploitation attempts
-
14:00 UTC
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
18:00 UTC
Added to Previdian KEV Feed
High-confidence, third-party report of exploitation attempts
-
18:00 UTC
CVE published
Vulnerability disclosed publicly
-
00:00 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2009-1537
Sample API response{
"cve_id": "CVE-2009-1537",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.5108,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}