The remote host is missing an update as announced via advisory SSA:2006-209-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2006-209-01

New Apache packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, and -current to fix a security issue with mod_rewrite. More details about the issues may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3747 In addition, new mod_ssl packages for Apache 1.3.37 are available for all of these versions of Slackware. This additional package does not fix a security issue, but may be required on your system depending on your Apache setup.