Synology has just released Update 4 for DSM 5. The updates fixes OpenSSL and Kerberos security issues among other things. The last Synology security exploit to hit the news was based on old vulnerabilities. So while it’s a pain you should plan to patch as soon as it’s practical. I updated my DS212J, DS212+ and DS1511+ without a problem. And so far, no new errors have surfaced.