cups.service ought to include "After=network.target" to avoid starting cupsd before it is able to bind to network sockets.
cups-1.7.5-10.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/cups-1.7.5-10.fc21
cups-1.7.5-8.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/cups-1.7.5-8.fc20
Package cups-1.7.5-10.fc21: * should fix your issue, * was pushed to the Fedora 21 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing cups-1.7.5-10.fc21' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-13104/cups-1.7.5-10.fc21 then log in and leave karma (feedback).
cups-1.7.5-11.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
cups-1.7.5-13.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.