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CVE-2009-3459

UnDefend

Heap-based buffer overflow in Adobe Reader and Acrobat 7.x before 7.1.4, 8.x before 8.1.7, and 9.x before 9.2 allows remote attackers to execute arbitrary code via a crafted PDF file that triggers memory corruption, as exploited in the wild in October 2009. NOTE: some of these de…

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Heap-based buffer overflow in Adobe Reader and Acrobat 7.x before 7.1.4, 8.x before 8.1.7, and 9.x before 9.2 allows remote attackers to execute arbitrary code via a crafted PDF file that triggers memory corruption, as exploited in the wild in October 2009. NOTE: some of these details are obtained from third party information.
CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.8/10
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: 86.53%: +0.43

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

Sources: 15 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

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
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
See all 15 source documents
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
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
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
Field Effect
Press · 17 Apr 2026, 07:00 · Three Microsoft Defender Zero-days Reported Exploited - Field Effect
CyberSecurityNews
Press · 17 Apr 2026, 07:00 · Leaked Windows Defender 0-Day Vulnerability Actively Exploited in Attacks - CyberSecurityNews
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

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 8.8 (2026-11-02 15:11). The curve appears once the score changes.

Public exploit evidence

2

Public exploit entries / repo candidates

Source entries and unverified repository candidates are counted separately.

Public exploit evidence
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 86.5%
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 13:57:23.112651+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
13 Oct 2009, 10:00
First press mention
17 Apr 2026, 07:00
Added to the CISA KEV catalog
20 May 2026, 00:00
Latest press mention
03 Sep 2026, 07:00
Score calculated
05 Nov 2026, 13:57
Name
UnDefend
PoCs on GitHub
2 repositories