The remote host is missing an update to yardradius announced via advisory DSA 598-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20598-1

Max Vozeler noticed that yardradius, the YARD radius authentication and accounting server, contained a stack overflow similar to the one from radiusd which is referenced as CVE-2001-0534. This could lead to the execution of arbitrary code as root. For the stable distribution (woody) this problem has been fixed in version 1.0.20-2woody1. For the unstable distribution (sid) this problem has been fixed in version 1.0.20-15. We recommend that you upgrade your yardradius package immediately.