CentOS Errata and Security Advisory 2007:0345
https://rhn.redhat.com/errata/RHSA-2007-0345.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/vixie-cron-4.1-19.EL3.s390.rpm
s390x: updates/s390x/RPMS/vixie-cron-4.1-19.EL3.s390x.rpm