Adobe Security Bulletin APSB15-14 for Adobe Flash Player describes a flaw that can possibly lead to code execution when Flash Player is used to play a specially crafted SWF file.

Quoting from the APSB15-14:

Adobe has released security updates for Adobe Flash Player for Windows, Macintosh and Linux. These updates address a critical vulnerability (CVE-2015-3113) that could potentially allow an attacker to take control of the affected system.

Adobe is aware of reports that CVE-2015-3113 is being actively exploited in the wild via limited, targeted attacks. Systems running Internet Explorer for Windows 7 and below, as well as Firefox on Windows XP, are known targets.

External References:

https://helpx.adobe.com/security/products/flash-player/apsb15-14.html