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Microsoft CVE-2009-4324

HIGH
Use After Free (CWE-416)
2009-12-15 psirt@adobe.com
7.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Re-analysis Queued
Apr 21, 2026 - 15:22 vuln.today
cvss_changed
Analysis Generated
Mar 26, 2026 - 11:17 vuln.today
Added to CISA KEV
Oct 22, 2025 - 01:15 cisa
CISA KEV
PoC Detected
Oct 22, 2025 - 01:15 vuln.today
Public exploit code
CVE Published
Dec 15, 2009 - 02:30 nvd
HIGH 7.8

DescriptionNVD

Use-after-free vulnerability in the Doc.media.newPlayer method in Multimedia.api in Adobe Reader and Acrobat 9.x before 9.3, and 8.x before 8.2 on Windows and Mac OS X, allows remote attackers to execute arbitrary code via a crafted PDF file using ZLib compressed streams, as exploited in the wild in December 2009.

AnalysisAI

Adobe Reader and Acrobat contain a use-after-free vulnerability in the Doc.media.newPlayer JavaScript method that was actively exploited as a zero-day in December 2009 via crafted PDF files with ZLib compressed streams.

Technical ContextAI

The CWE-416 flaw occurs when JavaScript code triggers the Doc.media.newPlayer method, causing a media player object to be freed while still referenced. Subsequent access to the freed object allows attackers to control execution flow. Exploits used ZLib compressed streams to bypass detection.

RemediationAI

Update to Adobe Reader/Acrobat 9.3+ or 8.2+. Modern mitigation: deploy PDF readers with exploit mitigations (sandbox, DEP, ASLR) or use browser-based PDF rendering.

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CVE-2009-4324 vulnerability details – vuln.today

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