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:
i386: vixie-cron-4.1-47.EL4.i386.rpm
src: vixie-cron-4.1-47.EL4.src.rpm