This script is Copyright (C) 2017 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
libgd developers report :
Double free vulnerability in the gdImagePngPtr function in libgd2
before 2.2.5 allows remote attackers to cause a denial of service via
vectors related to a palette with no colors.
See also :
Update the affected package.
Risk factor :
Medium / CVSS Base Score : 5.0