The Cisco Duo Policy Allow Network Bypass 2FA detection rule identifies when a Duo policy is implemented or modified to permit a network-based bypass of two-factor authentication (2FA). This detection is crucial as it highlights potential vulnerabilities in authentication mechanisms that could permit unauthorized access if a trusted network is compromised. The rule works by scrutinizing Duo administrator logs for actions that indicate policy creation or updates where the 'networks_allow' field is present. Such actions signify specific networks are given the authority to bypass 2FA controls. The system utilizes a Splunk search query to parse event descriptions and filter relevant changes, aggregating records by users and administrators to streamline detection. This real-time monitoring and alerting tool aids Security Operations Centers (SOCs) in responding promptly to risky policy modifications, which could increase the likelihood of account takeovers and lateral movements within the organization.