Nowadays fault attacks are widely deployed against secure devices by hardware evaluation centers. While the least expensive fault injection techniques, like clock or voltage glitches, are well taken into account in secure devices by dedicated hardware, more advanced techniques, such as light based attacks, require huge investments. To protect devices against these types of attacks requires complex detection or correction policies. However more and more solutions against light attacks are now available. In this context, this paper presents a new way to induce faults in computation at a moderate cost (few thousand euros) that may defeat already in place hardware counter-measures. To demonstrate its effectiveness we applied this technique on an ASIC component equipped with hardware counter-measures. For this demonstration, fault exploitation is operated using the classic Bellcore attack~\cite{BonDeMLip97} applied on a modular exponentiation supported by a modular arithmetic co-processor.