Hi,
As Nessus scan report, they are suggested to upgrade the kernel/linux version with linux-image-3.16.0-4-amd64_3.16.56-1 but this version is not available for upgrading on your Debian portal.
Can you please help us to upgrade the linux version
3.16.0-4-amd64_3.16.56-1 on debian 8.7?