This indicates an attack attempt against a Code Execution vulnerability in Apache Tomcat.
The vulnerability is due to an error when vulnerable software handles a PUT request with malformed file name. A remote attacker may be able to exploit this to upload arbitrary JSP file onto the affected system and execute arbitrary code.
Apache Tomcat version 7.0.0 to 7.0.79
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.