If you have installed Apple's Safari web browser on your Windows machine then this Security Advisory from Microsoft meant for you. According to this publication, there is a threat which allows remote code execution on windows platform through Safari. Currently the threat has not been exploited by anyone, but it is vulnerable.
How to avoid such exploitation?
- Uninstall Safari from Windows until Microsoft delivers security update for this problem.
- Or change the default download location of safari.
If you have changed the default location where Safari downloads the content.
Related: Safari sucks memory on Windows Vista