FireBird 2.5.5 allows remote authenticated users to cause a denial of service (daemon crash) by using service manager to invoke the gbak utility with an invalid parameter.
http://www.openwall.com/lists/oss-security/2016/01/10/2
http://tracker.firebirdsql.org/browse/CORE-5068
http://sourceforge.net/p/firebird/code/62783/
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177119.html