PuTTy – versatile client which supports Telnet, serial terminal and also SSH connection which you may use for controling of your RaspberryPi, OrangePi or another single-board computers, was released in version 0.71 which solves 8 security issues.
The description of security issues is available on https://thehackernews.com/2019/03/putty-software-hacking.html
The new release of PuTTy you can download on https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html