From: Apple Product Security
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APPLE-SA-2015-10-21-8 OS X Server 5.0.15

OS X Server 5.0.15 is now available and addresses the following:

BIND
Available for:  OS X Yosemite 10.10.5,
OS X El Capitan 10.11.1 or later
Impact:  Multiple vulnerabilities in BIND
Description:  Multiple vulnerabilities existed in BIND versions prior [...]