The PLC driver in ServerMain.exe in the Kepware KepServerEX 4 component in Schneider Electric StruxureWare SCADA Expert ClearSCADA 2010 R2 build 71.4165 2010 R2.1 build 71.4325 2010 R3 build 72.4560 2010 R3.1 build 72.4644 2013 R1 build 73.4729 2013 R1.1 build 73.4832 2013 R1.1a build 73.4903 2013 R1.2 build 73.4955 and 2013 R2 build 74.5094 allows remote attackers to cause a denial of service (application crash) via a crafted OPF file (aka project file).