The remote host is missing an update to zabbix announced via advisory DSA 2539-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202539-1

It was discovered that Zabbix, a network monitoring solution, does not properly validate user input used as a part of an SQL query. This may allow unauthenticated attackers to execute arbitrary SQL commands (SQL injection) and possibly escalate privileges. For the stable distribution (squeeze), this problem has been fixed in version 1:1.8.2-1squeeze4. For the testing distribution (wheezy), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 1:2.0.2+dfsg-1. We recommend that you upgrade your zabbix packages.