This indicates an attack attempt to exploit a Directory Traversal vulnerability in CentOS Web Panel.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted request. A remote attacker may be able to exploit this to read arbitrary file on the system.
CentOS Web Panel 0.9.8.480
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.