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What is a "Null Session Vulnerability"?
Connecting to system with admin username and password
Connecting to system with no username and no password
Connecting to system with random username and password
Connecting to system with employee's username and password
When a program or service is started by using the System user account, the service logs on with null credentials. This can be a potential security risk, because it allows for an unauthenticated log on to the system. A hacker or worm can exploit this vulnerability and potentially access sensitive data on the system.
Source: https://msdn.microsoft.com/en-us/library/ms913275(v=winembedded.5).aspx
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