This script is Copyright (C) 2017 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
The Xen Project reports :
In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine
cirrus_bitblt_cputovideo fails to check whether the specified memory
region is safe. A malicious guest administrator can cause an out of
bounds memory write, very likely exploitable as a privilege
See also :
Update the affected package.
Risk factor :