This indicates an attack attempt against a Cross-Site Scripting vulnerability in Advantech/BroadWin WebAccess.
The vulnerability is caused by a lack of sanitizing of the "ProjDesc" parameter that is passed to "gUpdate.asp". It allows a remote attacker to execute arbitrary script code via a crafted HTTP request.
Advantech/BroadWin WebAccess before 7.0
System Compromise: Remote attackers can execute arbitrary script code on vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.