The present disclosure relates to DNA vaccines against Crimean-Congo Hemorrhagic Fever (CCHF) virus. The present disclosure also relates to CCHF virus sequences and their use for vaccination such as DNA vaccination. The present disclosure more particularly relates to artificial nucleic acid molecules that are able to encode a CCHF polypeptide of an infectious CCHF virus, a fragment or a variant thereof. The nucleic acid molecules of the present application are formulated as immunogenic compositions.