Adobe Flash Player versions 23.0.0.205 and earlier, 11.2.202.643 and earlier have an exploitable use-after-free vulnerability. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201611-18
https://helpx.adobe.com/security/products/flash-player/apsb16-37.html
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-141
http://www.zerodayinitiative.com/advisories/ZDI-16-603
http://www.securitytracker.com/id/1037240