Security status of -2.0 or below means you'll be attacked in 1.0 systems.
Security status of -2.5 or below means you'll be attacked in 0.9 systems.
Security status of -3.0 or below means you'll be attacked in 0.8 systems.
Security status of -3.5 or below means you'll be attacked in 0.7 systems.
Security status of -4.0 or below means you'll be attacked in 0.6 systems.
Security status of -4.5 or below means you'll be attacked in 0.5 systems.