CentOS Errata and Security Advisory 2005:504
https://rhn.redhat.com/errata/RHSA-2005-504.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/telnet-0.17-26.EL3.3.s390.rpm updates/s390/RPMS/telnet-server-0.17-26.EL3.3.s390.rpm
s390x: updates/s390x/RPMS/telnet-0.17-26.EL3.3.s390x.rpm updates/s390x/RPMS/telnet-server-0.17-26.EL3.3.s390x.rpm