Updated ntp packages has been released for CentOS 6 and 7:

CESA-2016:0063 Important CentOS 6 ntp Security Update
CESA-2016:0063 Important CentOS 7 ntp Security Update

CESA-2016:0063 Important CentOS 6 ntp Security Update

CentOS Errata and Security Advisory 2016:0063 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2016-0063.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
b172e4c9936ba6db7e7df9a611f2ba305b0682bb0545c03ba23bc501ae7833f8 ntp-4.2.6p5-5.el6.centos.4.i686.rpm
0cbe654866db67e07ba4dbea484f6eea8136a0a23e5123dfebf1ac097162dfb4 ntpdate-4.2.6p5-5.el6.centos.4.i686.rpm
9a0cbc08c20ee5b43fd8518a2ccd0a13a274b0464a688fef4cc10b940c848993 ntp-doc-4.2.6p5-5.el6.centos.4.noarch.rpm
4fdf6a42d2a1178394d328832e70284d631a0b14535af97ffa94d659b545d4b8 ntp-perl-4.2.6p5-5.el6.centos.4.i686.rpm

x86_64:
c9bcbc789b84223a297f54197d407520f56d0d4d4775787dd0f746426d2e8866 ntp-4.2.6p5-5.el6.centos.4.x86_64.rpm
07fcdccf4e98b884fc6e99bf568fb037547d7340083ba913d598d0b53cc162d7 ntpdate-4.2.6p5-5.el6.centos.4.x86_64.rpm
9a0cbc08c20ee5b43fd8518a2ccd0a13a274b0464a688fef4cc10b940c848993 ntp-doc-4.2.6p5-5.el6.centos.4.noarch.rpm
c2069c233875863df714450ba095380586746768fab379e7fe737c915e27721f ntp-perl-4.2.6p5-5.el6.centos.4.x86_64.rpm

Source:
7a3f04e3f4c7402309a5a7cbf9a7997778298cd1dbac24efd2ca98b9d75eacec ntp-4.2.6p5-5.el6.centos.4.src.rpm

CESA-2016:0063 Important CentOS 7 ntp Security Update

CentOS Errata and Security Advisory 2016:0063 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2016-0063.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
4b606ea94878f359cc016e2fb3545c87af50b77cab65c21ca7daa534c5a49252 ntp-4.2.6p5-22.el7.centos.1.x86_64.rpm
4a320e7a12cf9b0e662e05a5371df9fe3b8fe3881f8b489ec02fc97769ac8628 ntpdate-4.2.6p5-22.el7.centos.1.x86_64.rpm
37c9092a5fc997a11dd02bd4748024584c305f691437e4546418e453cec19c7e ntp-doc-4.2.6p5-22.el7.centos.1.noarch.rpm
b71ff70a1dfd7ed80ad43c76d651b821b5cdc3cd4360b87f244b4aff154d5387 ntp-perl-4.2.6p5-22.el7.centos.1.noarch.rpm
71e36f16c2b105c208284bdfc4d08b1e93b0822fa7f08a569043c4cefdccf4f8 sntp-4.2.6p5-22.el7.centos.1.x86_64.rpm

Source:
207b221dcadaa5ce149bd47258f23eafe973686dfe31030d689850dfe6b4d9ed ntp-4.2.6p5-22.el7.centos.1.src.rpm