This indicates an attack attempt to exploit a Denial-of-Service vulnerability in Schneider Electric ClearSCADA.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted packet. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
Schneider Electric ClearSCADA 2009 version R1.3
Schneider Electric ClearSCADA 2009 version R2.2
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.