The Microsoft September 2021 security updates have been released and consist of 66 CVEs.
3 are rated Critical
62 are rated Important
1 Moderate in severity
Information regarding known issues with the security updates as well as the CVEs with FAQs, Mitigations and/or Workarounds can be viewed here:
In addition the full list of CVEs released by Microsoft for September 2021 can be found here along with other updates: