Firebird Security Updates for v2.1 and v2.5 series

The Firebird project has released Security Updates for the currently maintained 2.1.x and 2.5.x versions (v2.1.7 and v2.5.3 SU1). These updates fix a recently discovered security vulnerability (CORE-4630) that may be used for a remote DoS attack that could be performed by unauthorised users. We recommend Firebird users to upgrade as soon as is practical.

http://www.firebirdsql.org/en/news/security-updates-for-v2-1-and-v2-5-series-66011/