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 buffer overflow exploitation attempts in HP Power Manager Management Web Server.
HP Power Manager is a web-based application to manage an HP UPS.
HP Power Manager is prone to a remote code-execution vulnerability because it fails to properly bounds-check user-supplied data. This issue arises because the administration webserver fails to properly validate the 'Login' parameter, which can result in a stack-based buffer overflow.
An attacker can exploit this issue to execute arbitrary code with SYSTEM credentials, resulting in a complete compromise of the affected computer. Failed exploit attempts will result in a denial-of-service condition.
The vendor has released updates and an advisory. Please see the references for details.