The remote host is missing an update to znc announced via advisory DSA 1735-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201735-1

It was discovered that znc, an IRC proxy/bouncer, does not properly sanitize input contained in configuration change requests to the webadmin interface. This allows authenticated users to elevate their privileges and indirectly execute arbitrary commands (CVE-2009-0759). For the old stable distribution (etch), this problem has been fixed in version 0.045-3+etch2. For the stable distribution (lenny), this problem has been fixed in version 0.058-2+lenny1. For the unstable distribution (sid), this problem has been fixed in version 0.066-1. We recommend that you upgrade your znc packages.