Heap-based buffer overflow in nettransdll.dll in HistorySvr.exe (aka HistoryServer.exe) in WellinTech KingView 6.53 and 65.30.2010.18018 allows remote attackers to execute arbitrary code via a crafted op-code 3 packet.
http://www.zerodayinitiative.com/advisories/ZDI-11-351/
http://www.us-cert.gov/control_systems/pdf/ICSA-11-355-02.pdf
http://www.kingview.com/news/detail.aspx?contentid=587