PCU400, or Process Communication Unit 400, versions 4.4 through 4.6 suffer from a buffer overflow in the component that handles the IEC60870-5-101 and IEC60870-5-104 communication protocols.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70351/pcu400-overflow.txt
Source: https://packetstormsecurity.com/files/70351/pcu400-overflow.txt.html