Bring a large pot of lightly salted water to a boil. Place pasta in the pot, cook for 8 to 10 minutes, until al dente, and drain. Transfer to a bowl, cover, and chill 1 hour in the refrigerator.
Toss chilled pasta with the broccoli, cauliflower, red onion, garlic, pepperoni, mozzarella cheese, olives, olive oil, and red wine vinegar. Season with salt, pepper, and Italian seasoning. Chill in the refrigerator until serving.