Buffer overflow leading to application crash has been fixed in upstream [1]. [1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=779397#23
xterm-297-2.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
xterm-308-3.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.