NSS Labs researcher who disclosed serious holes in industrial control system software from Siemens says the company is downplaying the seriousness of the vulnerabilities in its public statements. Dillon Beresford has kept a low profile since deciding not to present a talk at the TakedownCon in Dallas on May 19. Siemens claims that security holes he discovered in the software used to control Siemens Simatic programmable logic controllers (PLCs) are hard to exploit and that a security feature in Siemens PLCs would prevent a compromise.
Source: https://threatpost.com/researcher-says-siemens-downplaying-serious-scada-holes-052411/75264/