This indicates an attack attempt against a directory-traversal vulnerability in multiple products.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted HTTP request. It allows a remote attacker to read arbitrary files on the target host.
Apache Software Foundation Tomcat 6.0.16 and previous versions
3Com Network Supervisor 5.1 and previous versions
3Com Network Director 2.0 and previous versions
Contact your vendor for upgrade or patch information.