Nation-state hackers pose a sustained risk to the Defense Industrial Base (DIB), the network of private companies that supplies the Department of Defense (DoD) with goods, services, and critical capabilities. “Under siege” describes that pressure; it does not mean every defense contractor has been breached. The government sources cited here do not establish a single, comprehensive count of DIB victims.
Why is the Defense Industrial Base a target?
DoD depends on private suppliers for goods and services that support national security. That makes the DIB strategically important—and means a cyber incident can matter beyond the loss or theft of information. If a supplier cannot run systems, deliver components, or sustain operations, the effect can include disruption to critical capabilities.
In 2026, the U.S. Government Accountability Office (GAO) said DoD relies on 200,000 private companies. That figure describes the scale of DoD’s supplier reliance, not the number of companies attacked or breached. GAO also identified external factors that could hinder program implementation, including the possibility that private industry may not have enough certified assessors. GAO’s 2026 review discusses those implementation concerns.
What do government advisories say about nation-state activity?
A joint advisory revised September 3, 2025, describes PRC state-sponsored actors compromising networks around the world, including military infrastructure networks. It reports that actors used compromised network devices and trusted connections to move into other networks, and that they may modify routers to preserve access. The advisory provides observed tactics, techniques, procedures, and mitigations; it is evidence about the activity it covers, not proof that every DIB incident is attributable to the PRC. Read the joint technical advisory.
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Separately, DoD said in May 2024 that the PRC and Russia were actively targeting U.S. critical infrastructure to position themselves to disrupt society and interfere with DoD operations during a crisis. DoD identified itself as the Sector Risk Management Agency for the DIB and described ongoing risk assessment and information-sharing with industry. This is DoD’s stated assessment, not a count of contractor breaches. DoD’s statement on National Security Memorandum 22 sets out that position.
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DoD’s deputy chief information officer for cybersecurity, David McKeown, said in March 2024: “Private sector DIB contractors are at risk for malicious cyber activities by adversaries and nonstate actors alike.” DoD’s strategy announcement includes the statement.
What does “under siege” establish—and what does it not?
The official material describes persistent threats, specific state-linked techniques, and the strategic consequences of disruption. It does not substantiate a DIB-wide, dated number of nation-state compromises, nor a share of contractors breached or total losses. Do not treat the 200,000 suppliers as targets or victims, or assume that all reported activity has a single state sponsor.
How is DoD trying to improve DIB cyber resilience?
DoD’s 2024 DIB Cybersecurity Strategy sets a three-year vision for a more secure and resilient industrial base. Its scope goes beyond keeping information confidential: it also calls for protecting integrity and improving availability so suppliers can maintain continuity of operations. The strategy identifies four goals:
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|---|---|
| Governance | Stronger DoD governance and coordination. |
| Cybersecurity posture | Improving cybersecurity across the DIB. |
| Resilience of critical capabilities | Protecting the ability to sustain and recover critical operations. |
| Collaboration | Closer coordination between DoD and industry, including threat-information exchange. |
The strategy also highlights vulnerability identification, recovery, interagency coordination, and attention to key suppliers. Read the 2024 DoD DIB Cybersecurity Strategy.
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How can defense contractors protect themselves from nation-state hackers?
DoD’s contractor-facing guidance lists practical starting measures. They help reduce common exposure and improve detection and recovery, but they do not replace determining the controls that apply to a specific contract or information system. DoD’s contractor guidance lists these practices:
- Keep network architecture diagrams and hardware and software inventories current.
- Patch devices and software, and configure them securely.
- Use active defenses.
- Monitor logs for anomalous activity.
- Use multifactor authentication (MFA).
- Protect email and web browsers.
- Use malware protection.
- Encrypt information at rest and in transit.
- Train staff.
- Exercise contingency, backup, recovery, and notification plans.
Prioritize measures in light of the systems and information your organization handles. For example, MFA is one recommended safeguard, not a stand-alone guarantee of compliance or security. A physical security key is one possible way to implement MFA, but buying a consumer key alone does not establish that an organization meets CMMC requirements.
What should a defense contractor do after a suspected cyber incident?
Preserve relevant logs and other evidence, use the applicable incident-reporting directions, and follow reporting obligations that apply to the organization and contract. The 2025 joint advisory includes contacts for CISA, the FBI, the NSA, and the DoD Cyber Crime Center, including Defense Industrial Base inquiries. It also describes network-device hardening and detection measures, while noting that investigators may not know how access was gained in some cases. Consult the advisory for its mitigation and reporting guidance.
What are the current CMMC requirements for defense contractors?
Cybersecurity Maturity Model Certification (CMMC) is DoD’s framework for assessing contractor cybersecurity based on the type and sensitivity of government information handled. As of October 4, 2026, DoD’s official CMMC page says Phase II implementation requirements were suspended on July 13, 2026. Phase I self-assessment requirements remain in place while the department reviews the program. Do not rely on older scheduled phase dates as current requirements. Check the live DoD CMMC page and the solicitation and contract terms that apply to your work; implementation and clauses can change.
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When assessing a compliance path or outside support, first establish whether the relevant systems handle Federal Contract Information (FCI) or Controlled Unclassified Information (CUI), then confirm the applicable CMMC level, assessment route, and contract obligations. Consider technical fit with your existing environment, support for detection and recovery, and assessor availability. GAO has specifically flagged assessor capacity as a possible implementation constraint; a provider’s suitability is organization- and contract-specific.
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