The remote host is missing an update to libnet-server-perl announced via advisory DSA 1122-1. Peter Bieringer discovered that the log function in the Net::Server Perl module, an extensible, general perl server engine, is not safe against format string exploits. The old stable distribution (woody) does not contain this package.
For the stable distribution (sarge) this problem has been fixed in version 0.87-3sarge1. For the unstable distribution (sid) this problem has been fixed in version 0.89-1. We recommend that you upgrade your libnet-server-perl package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201122-1