The remote host is missing an update to nagios-plugins announced via advisory DSA 1495-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201495-1

Several local/remote vulnerabilities have been discovered in two of the plugins for the Nagios network monitoring and management system. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-5198 A buffer overflow has been discovered in the parser for HTTP Location headers (present in the check_http module). CVE-2007-5623 A buffer overflow has been discovered in the check_snmp module. For the stable distribution (etch), these problems have been fixed in version 1.4.5-1etch1. For the old stable distribution (sarge), these problems have been fixed in version 1.4-6sarge1. We recommend that you upgrade your nagios-plugins package.