Hi @Ashwan ,
Did you mean network security process will trigger the SQL alter and sent the email notification to DBA email group? How did you define the SQL Server Alert? What will trigger the alter that you defined? Did you get any useful information from SQL error log?
Severity 25 Errors--- A severity 25 error is a fatal system error. I have heard that severity 25 is more or less a catch-all for miscellaneous fatal errors. I have only seen this error when related to failed upgrades: something prevents one of the upgrade scripts from running, and a severity 25 error is thrown. Quote from this blog Dealing with high severity errors in SQL Server.