CVE-2009-1862 in Flash Player
Summary
by MITRE
Unspecified vulnerability in Adobe Reader and Acrobat 9.x through 9.1.2, and Adobe Flash Player 9.x through 9.0.159.0 and 10.x through 10.0.22.87, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via (1) a crafted Flash application in a .pdf file or (2) a crafted .swf file, related to authplay.dll, as exploited in the wild in July 2009.
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Analysis
by VulDB Data Team • 04/22/2026
This vulnerability represents a critical memory corruption issue affecting multiple Adobe products that was actively exploited in July 2009. The flaw resides in the interaction between Adobe Reader/Acrobat and Adobe Flash Player components, specifically within the authplay.dll library which handles authentication and playback functions for embedded content. The vulnerability manifests when these applications process maliciously crafted content that triggers improper memory handling during content rendering. Attackers could leverage this weakness by embedding malicious Flash content within PDF files or by delivering standalone malicious SWF files that exploit the same underlying memory corruption mechanism.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write vulnerabilities. These classifications indicate that the flaw allows attackers to manipulate memory regions beyond their intended boundaries, potentially leading to arbitrary code execution or system crashes. The exploitation technique involves crafting specially designed Flash applications that when executed by vulnerable Adobe products cause memory corruption, enabling attackers to inject and execute malicious code on target systems. The authplay.dll component serves as the primary attack vector since it handles the loading and execution of embedded Flash content within PDF documents, making it a critical point of failure in Adobe's security architecture.
The operational impact of this vulnerability extends beyond simple code execution to include potential system compromise and denial of service conditions. When exploited successfully, attackers could gain complete control over affected systems, allowing them to install malware, steal sensitive data, or establish persistent backdoors. The widespread adoption of Adobe Reader and Flash Player made this vulnerability particularly dangerous, as it could affect millions of systems across various organizations and individuals. The attack vector through PDF files was especially concerning because PDFs are commonly used in business environments and are often automatically opened by default, increasing the attack surface significantly. Additionally, the vulnerability's ability to cause denial of service meant that even successful exploitation without code execution could disrupt business operations through system crashes or application instability.
Organizations should implement immediate mitigations including disabling Flash content in PDF documents, updating to patched versions of Adobe Reader and Flash Player, and implementing network-based controls to block known malicious content. The recommended approach involves following Adobe's security bulletins and applying patches promptly while also considering network segmentation to limit the potential impact of successful exploitation. Security teams should monitor for indicators of compromise related to this vulnerability and implement content filtering solutions that can detect and block malicious SWF and PDF files. The vulnerability also highlights the importance of maintaining up-to-date security practices and understanding the ATT&CK framework's techniques for malicious code execution, particularly T1059 for command and scripting interpreter and T1203 for exploitation for client execution. Regular security assessments and vulnerability scanning should include verification of Adobe product versions to ensure all systems are protected against this and similar memory corruption vulnerabilities.