SIMPLE.ERP client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affect SIMPLE.ERP from 6.20 to 6.30. Only the 6.30 version received a patch [email protected], which make it possible for an administrator to enforce encrypted communication. Versions 6.20 and 6.25 remain unpatched.