This indicates an attack attempt against a Buffer Overflow vulnerability in Schneider Electric's Interactive Graphical SCADA System (IGSS) application.
The vulnerability is caused by an integer underflow, in which leads to stack buffer overflow, when processing crafted input from ports 12397/TCP and 12399/TCP. It allows a remote attacker to gain control of the vulnerable system.
Schneider Electric Interactive Graphical SCADA System 10.x
Schneider Electric Interactive Graphical SCADA System 9.x
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.