The version of Apple Safari installed on the remote host is prior to 11.0.3. It is, therefore, affected by multiple vulnerabilities as described in the HT208475 security advisory.
Binary data 700502.prm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4088
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4089
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4096
www.nessus.org/u?20ca2ce2
support.apple.com/en-us/HT208475