Adobe Flash Player versions 23.0.0.207 and earlier, 11.2.202.644 and earlier have an exploitable memory corruption vulnerability in the NetConnection class when handling the proxy types. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201701-17
https://helpx.adobe.com/security/products/flash-player/apsb16-39.html
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-154