We want to present several 0days using fuzzing and reverse engineering and maths. 1 Critical remote 0day in an EMC application. 2 Critical remote 0day in a novosoft famous backup application. The main idea is to present 0days found by us and this 0days are not typical, are different, specially one of them which implies protocol/binary reverse engineering and complex maths and show to the audience how other kind of vulnerabilities can be found. We think that the idea of presenting different kind of 0days, which are critical, and explain how to discover this kind of vulnerabilities can be really interesting for the audience and they will have a new perspective in application security.