The National Institute of Standards and Technology (NIST) recently implemented a notable policy within its National Vulnerability Database (NVD). This policy involves placing a “deferred” status on Common Vulnerabilities and Exposures (CVEs) published before January 1, 2018. This shift is aimed at addressing the growing challenge of managing the vast number of documented vulnerabilities, prioritizing modern threats, and optimizing resource allocation.
What Does “Deferred” Status Mean?
Definition:
- A deferred CVE indicates that NIST will no longer actively update or enrich the metadata and associated details of vulnerabilities documented prior to the 2018 cutoff. These vulnerabilities will remain archived in the National Vulnerability Database (NVD), but they will not receive ongoing analysis unless exceptional conditions arise.
Reason for Deferment:
- The NVD has cataloged a massive volume of vulnerabilities over the years, driven by a surge in software development, IoT proliferation, and new attack vectors. By focusing on more recent vulnerabilities, NIST can dedicate its limited resources to vulnerabilities that pose the most immediate risks to organizations.
Scope:
- The deferred status applies to pre-2018 CVEs only, and newer vulnerabilities will continue to be prioritized for updates and analysis.
- Deferred CVEs can still be revisited upon request if new information emerges or critical risks are identified.
Why Did NIST Implement This Policy?
The decision to defer older vulnerabilities was driven by several key considerations:
1. Growth in Vulnerability Volume
- The frequency of reported CVEs has increased significantly over the past decade. As software and technology ecosystems have expanded, vulnerabilities across legacy systems, modern platforms, and cloud-based environments have also surged.
- Maintaining and continuously updating data for all vulnerabilities has become unsustainable, especially for older entries that may no longer reflect active threats.
2. Prioritization of Modern Threats
- Threat landscapes evolve rapidly, and cybercriminals primarily target modern systems, software, and networks. By deferring older CVEs, NIST aims to prioritize the analysis of vulnerabilities that impact current attack surfaces, including cloud platforms, zero-trust architectures, and modern software stacks.
3. Resource Optimization
- The NVD operates with finite resources, including analysts and tools for vulnerability research and enrichment. Streamlining operations allows the team to focus on:
- Emerging vulnerabilities with high exploitation potential.
- Enriching data related to high-risk CVEs, such as those listed in CISA’s Known Exploited Vulnerabilities (KEV) Catalog.
Implications for Organizations and Security Teams
1. Accessibility of Deferred CVEs
- While the deferred status means NIST will not actively update older CVEs, all archived entries remain publicly available in the NVD for reference and research.
- Security teams can continue to access and use pre-2018 CVE information for vulnerability assessments and historical analysis.
2. No Deprioritization of Severity
- Deferred status does not imply that older vulnerabilities are no longer relevant or severe. Many pre-2018 CVEs still represent critical risks if unpatched systems remain in use.
3. Increased Responsibility for Organizations
- Organizations must take greater responsibility for addressing older vulnerabilities independently, especially for legacy systems and software.
- Security teams should integrate deferred CVEs into their internal risk management frameworks and ensure they are not overlooked during patching processes.
4. Practical Benefits
- For security teams managing vast amounts of data, the policy encourages a focus on actionable threats, promoting a more strategic approach to vulnerability prioritization.
Benefits of the New Policy
1. Focus on Emerging Threats
- By dedicating resources to modern and future CVEs, NIST enhances the relevance and timeliness of its vulnerability data, ensuring organizations receive up-to-date intelligence on the most pressing threats.
2. Efficiency in Resource Utilization
- Deferred CVEs reduce the administrative burden on NIST, allowing its limited resources to be allocated toward enriching metadata, improving impact assessments, and fostering automated tools for recent vulnerabilities.
3. Alignment with Modern Cybersecurity Frameworks
- The policy aligns with contemporary risk-based vulnerability management approaches that prioritize actively exploitable vulnerabilities (e.g., those included in CISA’s KEV Catalog).
Challenges and Risks
1. Legacy System Risks
- Many older CVEs still affect legacy systems and hardware that remain operational in sectors like healthcare, manufacturing, and government. Without continuous updates, organizations reliant on these systems might underestimate the risks associated with older vulnerabilities.
2. Independent Oversight
- Deferring older CVEs could increase the responsibility of individual organizations to manually track, research, and evaluate risks posed by archived vulnerabilities.
3. Limited Automation for Deferred Data
- Security tools that rely on regularly updated NVD data might find reduced value in deferred CVEs, potentially requiring organizations to seek supplementary data sources.
Recommendations for Organizations
To adapt to the deferred status of older CVEs, organizations should consider the following actions:
1. Conduct Risk Assessments for Legacy Systems
- Identify legacy systems and software still in use that could be affected by pre-2018 vulnerabilities.
- Integrate deferred CVEs into routine vulnerability scans and patch management processes.
2. Use Supplemental Vulnerability Databases
- Leverage third-party tools, platforms, or services (e.g., Rapid7, Tenable, Qualys) that aggregate and enrich CVE information, including for older vulnerabilities.
3. Maintain Proactive Communication with Vendors
- Collaborate with software and hardware vendors to stay informed about legacy vulnerability advisories, patches, and mitigations.
4. Utilize Historical CVE Analysis
- Analyze older CVEs to better understand exploit trends, attack patterns, and the evolution of threat landscapes. This can provide valuable insights for developing robust security strategies.
5. Strengthen Organizational Cyber Hygiene
- Enforce strong patching routines and adopt modern cybersecurity practices, such as:
- Zero-trust architectures.
- Endpoint Detection and Response (EDR) tools.
- Regular penetration testing for older systems.
Long-Term Implications for the Cybersecurity Ecosystem
1. Focus on High-Impact Threats
- As NIST prioritizes newer vulnerabilities, the cybersecurity community as a whole will be encouraged to emphasize risks tied to evolving attack vectors.
2. Incentives for Modernization
- Organizations may be incentivized to phase out legacy systems and adopt newer technologies that benefit from proactive vulnerability management.
3. Strengthened Vendor Collaboration
- The policy underscores the need for software and hardware vendors to take greater responsibility for their products, particularly those with long life cycles, by maintaining comprehensive vulnerability disclosures.
Conclusion
The NIST policy to defer vulnerabilities published prior to 2018 reflects an evolving approach to managing the growing complexity of vulnerability data. By focusing on modern threats, NIST ensures that its resources are directed toward vulnerabilities with the greatest relevance to today’s cybersecurity challenges. However, it also places an increased onus on organizations to address legacy vulnerabilities independently and proactively.
Through a combination of modern tools, vendor collaboration, and robust risk management processes, organizations can continue to secure their environments against threats, both old and new.
