It's not. Read what I wrote in Reply #1, Okie. 99.9% of Mac OS X and iOS users are not at risk.
AirDrop works over WIFI or Bluetooth. . . but only over a distance of up to 30 meters. It is STILL limited by the requirements of UNIX permissions for installation, contrary to what this article implies about being able to put files anywhere on the target system.
So, 12mil macs and 75mil iphones sold per year. I guess those 87,000 people per year are statistically unimportant?