The remote host is missing an update to firebird2 announced via advisory DSA 1014-1. Aviram Jenik and Damyan Ivanov discovered a buffer overflow in firebird2, an RDBMS based on InterBase 6.0 code, that allows remote attackers to crash. The old stable distribution (woody) does not contain firebird2 packages.
For the stable distribution (sarge) this problem has been fixed in version 1.5.1-4sarge1. For the unstable distribution (sid) this problem has been fixed in version 18.104.22.16870-3 We recommend that you upgrade your firebird2 packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201014-1