The remote host is missing an update to kdelibs announced via advisory DSA 1998-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201998-1

Maksymilian Arciemowicz discovered a buffer overflow in the internal string routines of the KDE core libraries, which could lead to the execution of arbitrary code. For the stable distribution (lenny), this problem has been fixed in version 4:3.5.10.dfsg.1-0lenny4. For the unstable distribution (sid), this problem has been fixed in version 4:3.5.10.dfsg.1-3. We recommend that you upgrade your kdelibs packages.