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CVE-2009-1537

UnDefend

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 medi…

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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."
CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.6/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.8: +1.32
  • Fresh EPSS: 51.08%: +0.26

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 26 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

BleepingComputer
Press · 22 Sep 2026, 07:00 · New Windows Defender zero-day blocks Microsoft antivirus updates - BleepingComputer
Barracuda Blog
Press · 03 Sep 2026, 07:00 · Nightmare-Eclipse: six zero-days, six weeks and one big grudge - Barracuda Blog
Recorded Future
Press · 08 Jun 2026, 07:00 · May 2026 CVE Landscape - Recorded Future
SC Media
Press · 02 Jun 2026, 07:00 · Microsoft denies legal action against researchers after slamming BlueHammer publisher - SC Media
Cyber Press
Press · 01 Jun 2026, 07:00 · Microsoft Says It Won’t Sue Researchers in Nightmare-Eclipse Case - Cyber Press
See all 26 source documents
Cybernews
Press · 28 May 2026, 07:00 · Microsoft’s nightmare: GitLab removes rogue security researcher days after GitHub ban - Cybernews
Cyber Press
Press · 28 May 2026, 07:00 · Microsoft Warns Against Early Disclosure of Zero-Day Vulnerabilities - Cyber Press
Notebookcheck
Press · 22 May 2026, 07:00 · Microsoft patches Defender zero-days exploited in live attacks - Notebookcheck
Tech Times
Press · 21 May 2026, 07:00 · Microsoft Defender Zero-Days Patched: RedSun, UnDefend Exploits Already Used in Live Intrusions - Tech Times
Rescana
Press · 21 May 2026, 07:00 · Microsoft Defender Zero-Day Vulnerabilities RedSun and UnDefend Actively Exploited on Windows 10, 11, and Server (April 2026 CVE Analysis) - Rescana
Help Net Security
Press · 21 May 2026, 07:00 · Microsoft Defender vulnerabilities exploited in the wild (CVE-2026-41091, CVE-2026-45498) - Help Net Security
SecurityWeek
Press · 21 May 2026, 07:00 · Microsoft Patches Exploited UnDefend and RedSun Defender Zero-Days - SecurityWeek
The Hacker News
Press · 21 May 2026, 07:00 · Microsoft Warns of Two Actively Exploited Defender Vulnerabilities - The Hacker News
CyberSecurityNews
Press · 21 Apr 2026, 07:00 · Hackers Use Nightmare-Eclipse Tools After Compromising FortiGate SSL VPN Access - CyberSecurityNews
Dark Reading
Press · 21 Apr 2026, 07:00 · Exploits Turn Windows Defender Into Attacker Tool - Dark Reading
heise online
Press · 20 Apr 2026, 07:00 · Unpatched Windows zero-days RedSun, UnDefend, and BlueHammer are being attacked - heise online
Petri IT Knowledgebase
Press · 20 Apr 2026, 07:00 · Attackers Exploit Windows Zero-Days to Bypass Microsoft Defender - Petri IT Knowledgebase
SQ Magazine
Press · 19 Apr 2026, 07:00 · Windows Defender Security Flaws Actively Exploited by Hackers - SQ Magazine
LinkedIn
Press · 18 Apr 2026, 07:00 · WARNING: Three Microsoft Defender Zero-Days Under Active Attack As Two Remain Unpatched - LinkedIn
The Hacker News
Press · 17 Apr 2026, 07:00 · Three Microsoft Defender Zero-Days Actively Exploited; Two Still Unpatched - The Hacker News
Help Net Security
Press · 17 Apr 2026, 07:00 · Researcher drops two more Microsoft Defender zero-days, all three now exploited in the wild - Help Net Security
Field Effect
Press · 17 Apr 2026, 07:00 · Three Microsoft Defender Zero-days Reported Exploited - Field Effect
BornCity
Press · 17 Apr 2026, 07:00 · Windows Defender 0-days: BlueHammer (patched) and RedSun (unpatched)Born's Tech and Windows World - BornCity
BleepingComputer
Press · 17 Apr 2026, 07:00 · Recently leaked Windows zero-days now exploited in attacks - BleepingComputer
Cyber Press
Press · 17 Apr 2026, 07:00 · Windows Defender Zero-Day Leak Fuels Active Exploitation Campaigns - Cyber Press
CyberSecurityNews
Press · 17 Apr 2026, 07:00 · Leaked Windows Defender 0-Day Vulnerability Actively Exploited in Attacks - CyberSecurityNews

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.6 (2026-11-02 15:11). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.8; EPSS 51.1%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:57:22.188050+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
29 May 2009, 18:00
First press mention
17 Apr 2026, 07:00
Added to the CISA KEV catalog
20 May 2026, 00:00
Latest press mention
22 Sep 2026, 07:00
Score calculated
05 Nov 2026, 13:57
Name
UnDefend
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar