Adobe Flash Player versions 24.0.0.221 and earlier have an exploitable use after free vulnerability related to garbage collection in the ActionScript 2 VM. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201703-02
https://helpx.adobe.com/security/products/flash-player/apsb17-07.html
http://www.securitytracker.com/id/1037994