It does explicitly say that Security Update 2015-004 only updates Admin Framework on 10.10+ (it does not require 10.10.3) to fix CVE-2015-1130 : Emil Kvarnhamma

It does explicitly say that Security Update 2015-004 only updates Admin Framework on 10.10+ (it does not require 10.10.3) to fix CVE-2015-1130 : Emil Kvarnhammar at TrueSec https://support.apple.com/en-us/HT204659 https://support.apple.com/en-us/HT204659 Quite a few other security related things are fixed with this update that do apply to older versions of OS X.