Adobe Flash Player Integer Underflow Remote Code Execution Vulnerability (CVE-2014-0497)

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2014-0497) is an integer underflow (CWE-191) vulnerability residing within the ActionScript Virtual Machine (AVM) or media parsing engine of Adobe Flash Player. Due to insufficient validation of input values when calculating memory allocation sizes or array bounds, an integer value underflows into a negative number, which is subsequently interpreted as a very large unsigned integer. This leads to a heap-based buffer overflow when the application attempts to write more data than the allocated buffer can hold.

2. Exploitation Mechanics & Attack Scenario

An attacker exploits this vulnerability by hosting a malicious .swf file containing crafted ActionScript bytecode on a web server. When a victim with a vulnerable Flash Player version visits the malicious webpage, the Flash Player parses the malformed file, triggering the integer underflow. This allows the attacker to corrupt memory structures, bypass security mitigations, hijack the browser process execution flow, and execute arbitrary shellcode. This vulnerability is listed in CISA's KEV catalog and has an EPSS score of 0.9988, indicating active exploitation in the wild.

3. Infrastructure & Business Impact

Successful exploitation allows remote attackers to execute arbitrary commands with the privileges of the active user process. If the compromised process runs with administrative privileges, the entire endpoint can be fully compromised. This can serve as an initial access vector for corporate network intrusion, leading to data exfiltration, ransomware deployment, and lateral movement across internal infrastructure.