The (1) Catapult DNP3 I/O driver before 7.2.0.60 and the (2) GE Intelligent Platforms Proficy DNP3 I/O driver before 7.20k, as used in DNPDrv.exe (aka the DNP master station server) in GE Intelligent Platforms Proficy HMI/SCADA - CIMPLICITY and iFIX, allow physically proximate attackers to cause a denial of service (infinite loop) via crafted input over a serial line.
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