Intel has updated NUCs for the recent SMM EoP issue. They updated their servers earlier.
Recommendations: Intel highly recommends updating the BIOS of all Intel® NUC’s to the recommended BIOS or later listed in the table of affected products.
Acknowledgements: Intel would like to thank Security Researcher Dmytro Oleksiuk for discovering and reporting this issue.
As I understand it, this SMM issue impacts many systems, not just Lenovo and Intel-based products. If you have an OEM-based Intel system, check if they have updates. Lenovo and HP may have some, but it is still unclear about all the other OEMs and IBVs.