Abstract: The standard three-neutrino oscillation paradigm has been successfully built up over the last 15 years. However, this well-established picture suffers from some anomalous results reported at very short baselines (L/E≈m/MeV). If not experimental artifacts, these data could be interpreted as the existence of an additional neutrino species being insensitive to standard weak interactions. I will discuss the search for light sterile neutrinos with the CeSOX experiment aiming to deploy a 3.7 PBq 144Ce-based antineutrino generator a few meters away from the Borexino detector at the Gran Sasso laboratory.