This is a case where crucial information regarding your company's internal network has been disclosed on the internet without any unauthorized intrusion or breach by an attacker. What kind of problem does this situation represent?

Employees can inadvertently leak important details about your network to online forums or social media. For example, an organization’s VPN acceptable use policy or a network diagram document could be mistakenly attached to a Facebook post.
A file integrity check verifies that the file is intact and hasn’t been changed. A host-based firewall is a service that runs on a host and helps protect it from attackers by limiting and filtering network communications. Data loss prevention (DLP) software detects and prevents data theft on a network and can be configured to prevent data leakage. The question states the network has not been breached by an attacker.