WASHINGTON — A dangerous bug, known officially as the HeartBleed bug, has compromised the security of various popular websites. The bug, according to heartbleed.com, allows attackers to eavesdrop on communications, steal data directly from the services and users and to impersonate services and users.

So as a result, your favorite websites might have asked you to change your passwords. According to CNN Technology Analyst Brett Larson, you can use this site to test your server.