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

RHBA-2005:483-5 nss_db bug fix update

Files available: nss_db-2.2-13.1.3.i386.rpm nss_db-compat-2.2-13.1.3.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