The remote host is missing an update to fex announced via advisory DSA 2414-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202414-1

Nicola Fioravanti discovered that F*X, a web service for transferring very large files, is not properly sanitizing input parameters of the fup script. An attacker can use this flaw to conduct reflected cross-site scripting attacks via various script parameters. For the stable distribution (squeeze), this problem has been fixed in version 20100208+debian1-1+squeeze2. For the testing distribution (wheezy), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 20120215-1. We recommend that you upgrade your fex packages.