The host is installed with Python 2.x through 2.7.16, 3.x through 3.5.7, 3.6.x through 3.6.9 or 3.7.x through 3.7.4 and is prone to a security bypass vulnerability. The flaw is present in the application, which fails to properly handle an issue in parsing email addresses. Successful exploitation allows attackers to trick the application into accepting an email address that should be denied.