Higgs search in H rightarrow ZZ decay channels with the CMS detector

The prospects for the search of the Standard Model Higgs boson in the decay channel Hrightarrow ZZ^{(*) rightarrow 4} leptons (4e, 4? or 2e2?) with the CMS experiment at the LHC is presented. The analysis relies on a full simulation of the detector response and emphasis is put on the analysis steps and the strategies for the measurement of experimental and background systematics from data. The discovery reach at 14 TeV with an integrated luminosity of 1 fb^{-1} is derived as a function of the Higgs mass.