Stefan Viehböck is a security researcher/consultant with a strong focus on application security. While he spent some time reverse engineering embedded devices (MIPS/ARM) in the past, he has now moved on to large enterprise appliances. Stefan has discovered numerous vulnerabilities in software products. These include critical vulnerabilities in products from companies like: Barracuda Networks, F5, Siemens, Symantec, Telekom Austria and Vodafone. He has also found a flaw in the Wi-Fi Protected Setup (WPS) specification that enables a very powerful brute force attack on the WPS PIN. All major Wi-Fi router vendors are/were affected.