Firmware 10.2.1.8 released
The release notes say: "SMA-4401: Security hardening."
The information seems to more sparse each version released. The previous time there still was an email telling about hardening that was done, done in a marketing way, not really a security advisory. Before that there were critical vulnerabilities and immediate update was advised. Who knows how critical this time is since nothing is elaborated. Maybe a minor issue not really affecting anyone, but who can tell.