Assume for a moment that I’ve used this DNS exploit to take control of your email account. The most obvious effect is that I can now read your mail. Also, I can read your mail and continue forwarding it to you, so that you never realize there is a problem. I can add attachments to your messages, or infect existing attachments from people you trust with viruses or malware. When your best friend sends a link to you about that funny video on YouTube, well, I can rewrite that link to go anywhere I want.
Yes, folks, the DNS bug is for real and potentially serious. Here’s a bit of information on it.
And here’s the video from the man himself: