I can't say definitively, but I couldn't find a public posting on this by MicroTik at the time Cisco made their information public on Cisco's Talos bolg. So I contacted MT support through email and was told that they were notified of the vulnerability May 18, 2018 but had already patched it March of 2017. I looked at the changelog on MTs RouterOS and several vulnerabilities were patched back at the time.