2011年9月7日，美国国家审计署的总审计师在给参议院国土安全与政府事务委员会作证的证词中写到了DHS在保护网络空间安全方面面临的挑战：

Key challenges remain in DHS’s cyber security efforts. For example, to expand its protection and resiliency efforts, DHS needs to lead a concerted effort to consolidate and better secure Internet connections at federal agencies. Further, DHS faced challenges regarding deploying Einstein 2, including understanding the extent to which its objective was being met because the department lacked performance measures that addressed whether agencies report whether the alerts represent actual incidents. DHS also faces challenges in fully establishing a comprehensive national cyber analysis and warning capability. For example, the U.S. Computer Emergency Readiness Team did not fully address 15 key attributes of cyber analysis and warning capabilities. These attributes are related to (1) monitoring network activity to detect anomalies, (2) analyzing information and investigating anomalies to determine whether they are threats, (3) warning appropriate officials with timely and actionable threat and mitigation information, and (4) responding to the threat. For example, the U.S. Computer Emergency Readiness Team provided warnings by developing and distributing a wide array of notifications; however, these notifications were not consistently actionable or timely. Additionally, expectations of private sector stakeholders are not being met by their federal partners in areas related to sharing information about cyber-based threats to critical infrastructure.