The remote host is vulnerable to a buffer overflow.
The remote host is running a version of OpenSSH that is vulnerable to a flaw in the way that it handles GSSAPI authentication. If the SSH server is configured to utilize GSSAPI authentication then the host may be compromised by a remote attacker with access to the SSH port (typically 22). Successful exploitation would result in remote code execution.
Upgrade to version 4.4.p1 or higher.