kb4495623,May 2019 Security only update for the .NET Framework 4.8 for Windows Server 2012
kb4506954,July 2019 Security only update for the .NET Framework 4.8 for Windows Server 2012
kb4514330,September 2019 Security only update for the .NET Framework 4.8 for Windows Server 2012
kb4532950,January 2020 Security only update for the .NET Framework 4.8 for Windows Server 2012