Adobe Flash Player versions 25.0.0.127 and earlier have an exploitable use after free vulnerability in ActionScript2 when creating a getter/setter property. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201704-04
https://helpx.adobe.com/security/products/flash-player/apsb17-10.html
https://access.redhat.com/errata/RHSA-2017:0934
http://www.zerodayinitiative.com/advisories/ZDI-17-278/