This indicates an attempt to exploit a Cross Site Scripting (XSS) vulnerability in Juniper Netscreen ScreenOS.
The vulnerability can be exploited through crafted login attempts that lead to an XSS attack on the remote management interface of some network devices. This allows the attacker to redirect the log page and perform scripting actions on the device.
Juniper Netscreen ScreenOS 5.1.0
Juniper Netscreen ScreenOS 4.0.3
System Compromise: Cross site scripting.
Currently we are not aware of any vendor supplied patches for this issue.