The version of Apple Safari installed on the remote host is prior to 11.0.2. It is, therefore, affected by multiple vulnerabilities as described in the HT208324 security advisory.
Binary data 700501.prm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-13856
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-13866
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-13870
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7156
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7157
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7160
www.nessus.org/u?752a7790
support.apple.com/en-us/HT208324