Upgrade to Firebird 2.5.2 : Vulnerability Summary for CVE-2012-5529
Here is the full text for the CVE-2012-5529
TraceManager in Firebird 2.5.0 and 2.5.1, when trace is enabled, allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) by preparing an empty dynamic SQL query.
Solution to this Security vulnerability is to Upgrade to Firebird 2.5.2