The MongoDB server cannot verify some malformed BSON instances, causing preauthentication failures. Malformed BSON messages can trigger exceptions on the server, resulting in breakdown.
MongoDB 2.4.12, 2.6.7, 3.0.0-rc8
How to fix
The official MongoDB website has released a patch, which can be downloaded from: https://jira.mongodb.org/browse/SERVER-17264.
We recommend that you upgrade MongoDB to 2.4.13, 2.6.8, 3.0.0-rc9, or 3.1.0.