The development team at Blizzard says that all players who are using a Battle.net password that they are also employing on a service that has been affected by the SSL vulnerability known as the Heartbleed bug should change it in order to make sure that they are protected.
The studio makes it clear in the official announcement that the encryption of Battle.net itself was not directly affected in any way and that there is no cause to worry about the security of the game associated with it.
The team adds, "we recommend changing your Battle.net password to a new, unique password. As always, we recommend that you maintain separate login credentials for each online service you use. Using the same email or password across multiple services greatly increases the potential impact of any compromise."
Battle.net is used to centralize all information linked to video games like Diablo 3, World of Warcraft, and Starcraft 2, and the company has made it more important during the last few years.
A number of game-related services, including Steam, were affected by the Heartbleed problem, but most of them have implemented measures to make sure that they eliminated their own security problems in the last few days.