On May 1st, Intel released a security advisory regarding their Active Management Technology. It's a nasty one, but luckily it doesn't seem to affect home (non-datacenter) PC firmware.

https://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00075&l...

Intel has released a mitigation guide:

https://downloadcenter.intel.com/download/26754

Security researchers have since been able to uncover more details and release proof-of-concept exploit code. There is now a free nmap .nse plugin available to scan for this vulnerability:

https://nmap.org/nsedoc/scripts/http-vuln-cve2017-5689.html

To help prevent this from affecting AMPRNet systems, I am now blocking inbound port 16992 at the amprgw gateway. I hope this won't cause you any difficulties. - Brian