https://support.microsoft.com/en-au/topic/september-14-2021-cumulative-update-for-sharepoint-foundation-2013-kb5002021-997ea7b5-9618-4f8a-a794-c74fde10ae98
September 14, 2021, cumulative update for SharePoint Foundation 2013 (KB5002021) - Microsoft Support
cumulative updatefor sharepoint