The following errata for CentOS-2 have been built and uploaded the the centos mirror:

RHSA-2005:038-01 Updated mozilla packages fix a buffer overflow

Files available:
mozilla-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-chat-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-devel-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-dom-inspector-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-js-debugger-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-mail-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-nspr-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-nspr-devel-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-nss-1.4.3-2.1.5.c2.1.i386.rpm
mozilla-nss-devel-1.4.3-2.1.5.c2.1.i386.rpm

Notes:
mozilla has been modified to remove redhat default bookmarks and fix bug #120019

More details are available from the RedHat web site at
https://rhn.redhat.com/errata/rh21as-errata.html

The easy way to make sure you are up to date with all the latest patches is to run:
# yum update