This indicates an attack attempt to exploit a Code Injection Vulnerability in PhpWiki module.
The vulnerability is due to an error when the vulnerable module handles a crafted HTTP request. A remote attacker could exploit this to execute arbitrary code within the context of target application, via a crafted HTTP request.
VA Linux Systems PhpWiki 1.5.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.