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

RHSA-2005:812-00 Important: wget security update

Files available:
wget-1.10.2-0.AS21.i386.rpm

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