Pour the water into a saucepan and bring it to a boil over medium heat.
Sprinkle the gelatin, cinnamon, and sugar into the boiling water. Stir until the gelatin and sugar fully dissolve.
Remove the pan from heat. Stir in the cranberry juice, lime juice, and vodka until the mixture is smooth.
Place the gummy worms into the bottom of four shot glasses.
Divide the liquid mixture evenly among the four glasses.
Refrigerate the shots for at least four hours until they set firmly.