I received about 50 messages today with the similar message:
WordPress Firewall has detected and blocked a potential attack!
Web Page: domain.com/index.php?option=com_simpledownload&controller=../../../../../../../../../../../../../../../proc/self/environ%00 Warning: URL may contain dangerous content! Offending IP: 211.147.221.42 [ Get IP location ] Offending Parameter: controller = ../../../../../../../../../../../../../../../proc/self/environ
This may be a "Directory Traversal Attack."
How much should I worry about these? It came from multiple IP addresses throughout the day.