CVE-2016-4117 in Flash Player
Summary
by MITRE
Adobe Flash Player 21.0.0.226 and earlier allows remote attackers to execute arbitrary code via unspecified vectors, as exploited in the wild in May 2016.
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Analysis
by VulDB Data Team • 04/23/2026
Adobe Flash Player vulnerability CVE-2016-4117 represents a critical remote code execution flaw that affected versions 21.0.0.226 and earlier. This vulnerability falls under the category of unspecified attack vectors, making it particularly dangerous as security researchers and threat actors could exploit multiple potential pathways within the Flash Player runtime environment. The vulnerability was actively exploited in the wild during May 2016, demonstrating its significance and the urgency with which organizations needed to address it. The flaw resides in the Flash Player's handling of certain data structures and memory management operations that could be manipulated by malicious actors to inject and execute arbitrary code on affected systems.
The technical nature of this vulnerability stems from improper input validation and memory corruption issues within the Flash Player's processing mechanisms. When Flash Player encounters specially crafted content, particularly in multimedia files or web pages that utilize Flash, it fails to properly validate the incoming data before processing it. This allows attackers to craft malicious content that triggers buffer overflows, use-after-free conditions, or other memory corruption scenarios. The vulnerability operates at the runtime level of the Flash Player, meaning that successful exploitation occurs when the player attempts to render malicious Flash content, typically through web browsers or other applications that embed the Flash runtime. The attack surface is broad as Flash Player was widely deployed across various platforms and applications, making it an attractive target for cybercriminals seeking to compromise large numbers of systems.
The operational impact of CVE-2016-4117 was substantial, as it enabled attackers to gain complete control over affected systems without requiring user interaction beyond visiting a malicious webpage or opening a compromised file. This type of vulnerability aligns with the ATT&CK framework's technique T1203, which covers exploitation for privilege escalation, and T1059, which encompasses command and scripting interpreter usage. The vulnerability's exploitation capability allows for the execution of arbitrary code, which can lead to full system compromise, data exfiltration, and persistence mechanisms. Organizations that had not updated their Flash Player installations were particularly vulnerable, as the default installation of Flash Player in many browsers and applications provided an attack vector that required no additional privileges or complex social engineering techniques. The widespread deployment of Flash Player across both desktop and mobile platforms meant that exploitation could occur across multiple device types and operating systems.
Mitigation strategies for CVE-2016-4117 centered on immediate patching and deployment of Adobe's security updates, which addressed the underlying memory corruption issues. Organizations should have implemented comprehensive patch management procedures to ensure all instances of Flash Player were updated promptly. The vulnerability's exploitation pattern also highlighted the importance of network segmentation and application whitelisting, as these measures could prevent the execution of malicious Flash content even if users inadvertently encountered compromised websites. Security professionals recommended disabling Flash Player in web browsers where possible and implementing web application firewalls to filter out malicious Flash content. Additionally, the incident underscored the necessity of maintaining up-to-date threat intelligence feeds and implementing robust monitoring for suspicious network activity that might indicate exploitation attempts. The vulnerability's classification under CWE-119, which addresses memory-related issues, emphasized the need for secure coding practices and regular security assessments of runtime environments. Organizations that had already begun migrating away from Flash-based content and applications were better positioned to avoid the impact of this vulnerability, demonstrating the importance of proactive security measures and technology migration planning.