We were not able to reproduce this issue in 6.47.10/6.48.5 versions. There have been other IPv6 related fixes since then, for example, https://blog.mikrotik.com/software/cve- ... stion.html
It is a false positive.
Could you please send us email, about your setup and problem, to support@mikrotik.com?Have the same problem with UF-SM-10G & CRS317-1G-16S+ with 6.42.12.
Any RoOS version with fix?
You can find trainers here https://mikrotik.com/training/centers/europeHello. Tell me, please, where in Ukraine can I study and pass the MTCNA exam?
To upgrade factory firmware you need to use special package that can be found here:How to upgrade factory firmware (RouterBOOT)?