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