When a new Linux hosting node is installed, there are two pre-installed PHP handlers in Service Nodes > New Node > Apache Extensions:
PHP Version PHP Binary Path 5.3.0 fastcgi 5.3.3 /usr/bin/php-cgi
FastCGI actually uses the same binary, so the version should be 5.3.3 for it as well.
This behavior is caused by program code defect #POA-107626.
Contact your Technical Account Manager or Pooled Technical Associate Team via email@example.com in order to find out the current status of #POA-107626.