No one else has won at Pwn2Own three times.

When his turn came, Pwn2Own newcomer Peter Vreugdenhil successfully exploited a in IE8 running on with attack code called "technically impressive" by TippingPoint because it bypassed the operating system's Data Execution Prevention, or DEP, security mechanism, which is designed to stop most attacks.

Like Miller, Vreugdenhil, a freelance vulnerability researcher from the Netherlands, earned a $10,000 prize.

Another former winner, a German computer science student known only by his first name, Nils, was awarded $10,000 for hacking Firefox on Windows 7.

Of the browsers set up as targets for the contest, only 's Chrome remained standing on the first day.