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

RHBA-2006:0503-3 dump bug fix update

Files available:
dump-0.4b41-1.EL21.1.i386.rpm
rmt-0.4b41-1.EL21.1.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