The remote host is missing an update as announced via advisory SSA:2005-195-02.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2005-195-02

New XV image viewer packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix security issues. Format string and other issues could cause a crash or execution of arbitrary code if a specially crafted image is loaded with XV.