Improper serialization of internal state in the authorization subsystem in MongoDB Server's authorization subsystem permits a user with valid credentials to bypass IP whitelisting protection mechanisms following administrative action. This issue affects: MongoDB Inc. MongoDB Server 4.2 versions prior to 4.2.3; 4.0 versions prior to 4.0.15; 4.3 versions prior to 4.3.3; 3.6 versions prior to 3.6.18.