The remote FreeBSD host is missing one or more security-related updates.
MITRE reports : Multiple vulnerabilities have been found in FFmpeg. Please refer to CVE list for details. Note: CVE-2017-15186 and CVE-2017-15672 affect only the 3.3 branch before 3.3.5, CVE-2017-16840 and CVE-2017-17081 have been fixed in 3.4.1. They're listed here for completeness of the record.