Adobe Flash Player versions 24.0.0.186 and earlier have an exploitable use after free vulnerability in the ActionScript FileReference class, when using class inheritance. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201702-20
https://helpx.adobe.com/security/products/flash-player/apsb17-02.html
http://www.securitytracker.com/id/1037570