[CentOS] openssh-5.3p1-123.el6_9.x86_64.rpm for CESA-2017:2563 not available in mirror.centos.org centos6 repo

The patch for CESA-2017:2563 announced at
https://lists.centos.org/pipermail/centos-announce/2017-August/022529.html
is only available in the centos 6.9 repo. It is missing for the generic
centos-6 repo at http://mirror.centos.org/centos-6/6/os/x86_64/Packages/.
Typically this repo contains all the latest patches for the latest minor
release, but it's missing the new version of openssh. I assume this is by
mistake, but please correct me if I am wrong.

Thanks
Dustin