A new release of Openfire with critical bug fixes has been released. It is highly recommended for existing installation to upgrade to this new release. The complete set of fixes can be found here. The SIP plugin should be updated too.
Download Openfire from: http://www.igniterealtime.org/downloads/index.jsp
Download Connection Manager from: http://www.igniterealtime.org/projects/openfire/connection_manager.jsp
Enjoy!
Openfire Team