According to the Law, a foreigner who has married an Italian citizen can become an Italian citizen. This is valid whether your spouse is an Italian citizen by birth or obtained the citizenship for instance, after being a legal resident for ten years.
This is a right of all spouses of Italian citizens, and it can only be denied to those who have been sentenced for serious crimes either in Italy or abroad. It can also be denied to those who are considered a threat to the national security and public order.
One doesn’t automatically acquire Italian citizenship after marrying an Italian citizen. There are conditions to be met and a procedure to be followed in applying for citizenship.