This indicates an attack attempt to exploit a Directory Traversal Vulnerability in Quest Software NetVault Backup.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted request. An attacker can exploit this to overwrite arbitrary files on the affected machine via a crafted request.
Quest Software NetVault Backup prior to 188.8.131.52
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor: