INTERIM CISA DIRECTOR WARNS DHS SHUTDOWN WOULD WEAKEN U.S. CYBER DEFENSE CAPACITY

The acting head of the Cybersecurity and Infrastructure Security Agency (CISA) warned lawmakers that even a temporary interruption in funding to the Department of Homeland Security would strain the federal government’s ability to defend against ongoing cyber threats.

Testifying before the House Appropriations Homeland Security Subcommittee, Acting Director Madhu Gottumukkala stated that a shutdown would degrade CISA’s ability to deliver timely and actionable guidance to public- and private-sector partners responsible for defending critical infrastructure.

“When the government shuts down, cyber threats do not,” Gottumukkala told the panel, emphasizing that adversarial cyber operations continue uninterrupted regardless of federal budget impasses.

According to the acting director, a lapse in funding would force more than one-third of CISA’s frontline security experts and threat hunters to continue working without pay while simultaneously curtailing several proactive missions. Core activities such as digital response operations, vulnerability scanning, and strategic threat analysis would be reduced to only those functions deemed essential for the protection of life and property.

Under shutdown protocols, CISA would shift from proactive risk mitigation to reactive response. Gottumukkala described a posture in which the agency could respond to imminent and immediate threats but would be limited in its ability to conduct preventative vulnerability assessments or long-term strategic planning.

The warning comes amid mounting uncertainty over DHS funding as lawmakers attempt to negotiate broader policy disputes. A short-term funding measure is set to expire, increasing the likelihood of at least a partial departmental shutdown if an agreement is not reached.

In addition to workforce disruptions, Gottumukkala indicated that progress on a long-anticipated cyber incident reporting rule would be delayed. That rule is intended to formalize reporting requirements for critical infrastructure operators following significant cyber incidents, a measure viewed as central to improving national visibility into threat activity.

CISA has already experienced staffing shifts in recent months. Approximately 70 employees have been reassigned to other DHS components under internal authorities, while more than 30 personnel from other DHS elements have been absorbed into CISA. A limited number of employees have reportedly been detailed to Immigration and Customs Enforcement. Overall, the agency has seen staffing reductions approaching one-third since the beginning of the current administration.

Members of the subcommittee expressed sharply divided views regarding the operational impact of a DHS shutdown. Republican members argued that core immigration enforcement functions would continue regardless of funding disputes, while Democratic members introduced legislation that would maintain funding for DHS components excluding Immigration and Customs Enforcement and Customs and Border Protection.

The funding debate underscores a structural challenge within cybersecurity governance: federal cyber defense relies on sustained operational continuity. Unlike many domestic programs, cyber threat monitoring operates on a continuous basis. Network intrusion attempts, ransomware campaigns, espionage operations, and infrastructure probing do not align with fiscal calendars.

CISA serves as the central civilian cyber defense coordination hub for the United States, supporting state and local governments, utilities, healthcare providers, transportation systems, and private-sector critical infrastructure operators. A shift from proactive to reactive posture would narrow the federal government’s ability to detect vulnerabilities before adversaries exploit them.

The broader issue raised during the hearing is not limited to pay disruptions. It is the strategic risk created when deterrence and vulnerability mitigation functions are paused while adversaries maintain full operational tempo.

The funding outcome remains unresolved.

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