CVE-2018-15982 in Flash Player
Summary
by MITRE
Flash Player versions 31.0.0.153 and earlier, and 31.0.0.108 and earlier have a use after free vulnerability. Successful exploitation could lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 11/17/2025
The vulnerability identified as CVE-2018-15982 represents a critical use after free flaw within Adobe Flash Player software that affects multiple versions including 31.0.0.153 and earlier, as well as 31.0.0.108 and earlier releases. This type of vulnerability occurs when a program continues to reference memory that has already been freed or deallocated, creating a dangerous condition where malicious actors can manipulate the program's behavior by controlling the freed memory location. The flaw exists in the memory management implementation of Flash Player's ActionScript virtual machine and represents a classic example of memory safety issues that have plagued software development for decades. The vulnerability is particularly concerning because it allows for arbitrary code execution, meaning that an attacker who successfully exploits this flaw can gain complete control over the affected system. This use after free condition typically arises from improper handling of object references and memory deallocation sequences within the Flash Player runtime environment where objects are not properly validated before being accessed after their memory has been released.
The technical exploitation of CVE-2018-15982 involves crafting malicious Flash content that triggers the specific memory management error during normal playback operations. When Flash Player processes the malicious content, it executes code that causes an object to be freed from memory while references to that object still exist in the program's execution flow. Attackers can leverage this condition to overwrite the freed memory with malicious code or manipulate the program's execution path to redirect control flow. The vulnerability's impact is amplified by Flash Player's widespread deployment across various operating systems and applications, making it an attractive target for cybercriminals seeking to establish persistent access to victim systems. This flaw aligns with CWE-416, which specifically addresses use after free conditions in software development, and represents a fundamental memory safety issue that has been consistently identified as one of the most dangerous classes of vulnerabilities in software security.
The operational impact of this vulnerability extends far beyond individual system compromise, as Flash Player's integration into web browsers and enterprise applications creates a massive attack surface. Successful exploitation can result in complete system compromise, data theft, privilege escalation, and establishment of persistent backdoors within target environments. Organizations that continue to use outdated Flash Player versions face significant risk of targeted attacks, especially in environments where legacy applications still depend on Flash functionality. The vulnerability's exploitation typically requires user interaction through web browsing or opening malicious files, making social engineering attacks particularly effective when combined with this memory corruption flaw. From a threat actor perspective, this vulnerability provides a reliable path to execute arbitrary code on vulnerable systems, often bypassing standard security controls and operating system protections that would normally prevent such malicious activities.
Mitigation strategies for CVE-2018-15982 primarily focus on immediate remediation through software updates and comprehensive system hardening measures. Adobe strongly recommended upgrading to Flash Player version 31.0.0.154 or later, which contains the necessary patches to address the use after free vulnerability. Organizations should implement robust patch management processes to ensure all Flash Player installations are updated promptly, as the vulnerability affects multiple versions and platforms. Additional defensive measures include implementing browser security restrictions such as disabling Flash content execution, using sandboxing technologies, and deploying network monitoring tools to detect suspicious Flash-related activities. Security teams should also consider implementing application whitelisting policies that restrict Flash Player execution to trusted environments only, while maintaining detailed logging of Flash Player usage patterns to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date software components and implementing layered security approaches, as the use after free condition represents a fundamental flaw in memory management that can be exploited regardless of other security measures in place. Organizations should also consider migrating away from Flash-based content entirely, as Adobe officially discontinued Flash Player support in 2020, making continued use of vulnerable versions increasingly dangerous and unsupported from a security standpoint.