The remote host is missing an update as announced via advisory SSA:2004-305-01.
New apache packages are available for Slackware 8.1, 9.0, 9.1, 10.0, and -current to fix a security issue. Apache has been upgraded to version 1.3.33 which fixes a buffer overflow which may allow local users to execute arbitrary code as the apache user. The mod_ssl package has also been upgraded to version 2.8.22_1.3.33. More details about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0940