Intrusion Prevention



This indicates an attempt to use Ysoserial JSP web shell.
A web shell is a script that can be uploaded to a web server to enable remote administration of the machine. Installation of a web shell is commonly accomplished through web application vulnerabilities or configuration weaknesses.

Affected Products

Any compromised server


System Compromise: Remote attacker can gain control of vulnerable systems.

Recommended Actions

Remove the malicious JSP file from the server.