This indicates an attempt to exploit a memory corruption vulnerability in Firebird SQL.
There is a vulnerability in Firebird SQL that may allow remote attackers to trigger memory corruption. It can be exploited via crafted (1) op_receive, (2) op_start, (3) op_start_and_receive, (4) op_send, (5) op_start_and_send, or (6) op_start_send_and_receive XDR requests.
Firebird SQL 1.0.3 and before.
Firebird SQL 1.5.5 and before.
Firebird SQL 2.0.3 and before.
Firebird SQL 2.1.0 Beta 2 and before.
System Compromise: remote attackers can gain control of vulnerable systems.
Upgrade to the latest version.
Firebird SQL 1.5.6 (to be released)
Firebird SQL 2.0.4 (to be released)
Firebird SQL 2.1.0 RC1