An attacker could attempt to eavesdrop the transmission of client credentials between the client and server during the client authentication process or during OAuth token requests.
OAuth 2.0 Threat Model and Security Considerations (RFC6819, section 4.3.3)
This threat is considered fully mitigated if all the test cases from one of the following test sets succeed.
The impact factor is a measure that indicates how important a given countermeasure is towards mitigating a threat.
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