An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.

https://capec.mitre.org/data/definitions/331.html

Related CWE definitions

The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.
Please note that CAPEC definitions are provided as a quick reference only. Visit http://capec.mitre.org/ for a complete list of CAPEC entries and more information.
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