This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects attempts to exploit a buffer overflow in the the Universal Plug and Play service.
A remote code execution vulnerability exists in the Universal Plug and Play service in the way that it handles specially formed HTTP requests. An attacker who has successfully exploited this vulnerability in conjunction with another exploit could take complete control of an affected system
Download and install the Microsoft patches applicable to this vulnerability.