The following errata for CentOS-2 have been built and uploaded the the centos mirror:
RHSA-2004:537-01 Updated openmotif packages fix image vulnerability
Files available: openmotif-2.1.30-13.21AS.4.i386.rpm openmotif-devel-2.1.30-13.21AS.4.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