Preheat oven to 325 F. Grease and flour bundt pan.
In a large bowl cream together butter and sugar. Beat in eggs and vanilla followed by buttermilk.
Add in flour, salt, baking powder and soda mixing until well combined.
Bake in preheated oven 50 minutes or until tester comes out clean. Remove from oven and set aside.
Melt sugar, butter, vanilla, water, salt and cinnamon in a small saucepan over medium low heat. Do not boil. This is your sauce.
With a large skewer, poke holes all over the cake while still warm. Pour syrup all over cake, waiting until it is absorbed before you add more. Use it all.
Let cake cool completely in pan. Remove to wire rack. Serve or cover until ready to serve.