Hello Dirce,
On Wed, 2011-12-14 at 10:17 -0500, drsystems@globalcerts.net wrote:
I did some research on the Internet, but can't find the following information: are most of the security fixes that appear in httpd-2.2.21 applied to the update on httpd-2.2.15-9?
As CentOS is merely a rebuild of Red Hat Enterprise Linux it's probably best to subscribe to the enterprise watch list ( https://www.redhat.com/mailman/listinfo/enterprise-watch-list ) if you want to keep track of upstream security fixes. Note that this list only announces security fixes not bug fixes.
For a full list of update announcements visit https://rhn.redhat.com/errata/ . Note that CentOS-6 is a merge of the different versions Red Hat provides, so you might have to browse multiple lists to get a complete overview.
Regards, Leonard.