The xdr_status_vector function in Firebird before 2.1.7 and 2.5.x before 2.5.3 SU1 allows remote attackers to cause a denial of service (NULL pointer dereference, segmentation fault, and crash) via an op_response action with a non-empty status.
advisories.mageia.org/MGASA-2014-0523.html
lists.opensuse.org/opensuse-security-announce/2014-12/msg00012.html
tracker.firebirdsql.org/browse/CORE-4630
www.debian.org/security/2014/dsa-3109
www.firebirdsql.org/en/news/security-updates-for-v2-1-and-v2-5-series-66011/
www.mandriva.com/security/advisories?name=MDVSA-2015:172
usn.ubuntu.com/3929-1/