There is a new Linux crypto miner exploit out. It is based on the Dirty COW exploit, so if your system is not vulnerable for DC, you don’t have to worry.
This not directly NethServer related, but it is a Linux issue, so it might be of interest for us all.
IFAIK there is no official statement, but you could do the test yourself… (and it would be appreciated to report back what you find out 
)
Latest kernel for NS7:
uname -a
Linux srv.domain.tld 3.10.0-862.14.4.el7.x86_64 #1 SMP Wed Sep 26 15:12:11 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
What I could find is that kernels 3.8.9 and earlier are vulnerable. So NS7 look like to be ok… (but testing is always better to be sure)