Overview
The Center for Internet Security (CIS) is a leading non-profit cybersecurity organization founded in 2000 that has become a trusted authority in developing security standards, benchmarks, and guidelines. CIS operates under the principle that standardized, consensus-driven security controls and best practices significantly reduce organizational risk and improve overall cybersecurity posture. The organization partners with government agencies, enterprises, academic institutions, and technology vendors to create practical, implementable security guidance.
Mission and Purpose
CIS is dedicated to safeguarding public and private organizations against cyber threats. The organization identifies consensus best practices based on empirical evidence and real-world vulnerability data. By providing freely available resources and premium tools, CIS enables organizations of all sizes to strengthen their security defenses, reduce attack surface exposure, and comply with regulatory requirements. CIS benchmarks have become industry standard references for security configurations across diverse IT environments.
Key Products and Services
CIS Controls
The CIS Controls (formerly known as the SANS Top 25) represent a prioritized set of 18 actionable cybersecurity best practices and safeguards. These controls are organized into three implementation groups based on organizational size and complexity:
- Implementation Group 1 (IG1): Essential controls for all organizations; foundational security practices applicable to small to medium-sized organizations
- Implementation Group 2 (IG2): Intermediate controls for organizations with dedicated IT and security staff managing complex IT environments
- Implementation Group 3 (IG3): Advanced controls designed for large enterprises with mature security programs and sophisticated threat landscapes
Each control includes specific actions, success metrics, and guidance on implementation prioritization. The CIS Controls framework addresses prevention, detection, and response capabilities, helping organizations reduce breach likelihood and severity.
CIS Benchmarks
CIS Benchmarks are comprehensive configuration guidelines and best practices for hardening operating systems, applications, cloud platforms, and network devices. These detailed technical documents provide step-by-step hardening recommendations with security rationales. Key benchmark categories include:
- Operating System Benchmarks: Windows, Linux (various distributions), macOS, and other OS-specific hardening configurations
- Application Benchmarks: Guidance for securing common enterprise applications like browsers, databases, web servers, and container technologies
- Network Device Benchmarks: Configuration standards for firewalls, routers, switches, and load balancers
- Cloud Platform Benchmarks: Best practices for AWS, Microsoft Azure, Google Cloud Platform, and other cloud environments
- Mobile Device Benchmarks: Security guidance for iOS and Android devices
Organizations use CIS Benchmarks as foundational configuration templates to reduce vulnerabilities and ensure consistent security posture across their infrastructure.
CIS SecureSuite Tools
CIS provides automated assessment and remediation tools under the CIS SecureSuite brand, including CIS-CAT (Configuration Assessment Tool) for vulnerability scanning and compliance validation. These tools automatically assess systems against CIS Benchmarks, identify misconfigurations, and generate detailed reports for remediation planning.
Importance in Cybersecurity
Regulatory and Compliance Alignment
CIS Controls and Benchmarks align with major regulatory frameworks and compliance standards, including NIST Cybersecurity Framework, PCI-DSS, HIPAA, GDPR, SOC 2, and ISO 27001. Organizations using CIS guidance demonstrate proactive risk management and can more efficiently achieve compliance certifications. Regulators and auditors increasingly recognize CIS standards as evidence of reasonable and appropriate security controls.
Risk Prioritization
By organizing controls into implementation groups and prioritizing recommendations by impact, CIS helps organizations focus limited security resources on the most critical protective measures. This risk-based approach enables cost-effective security program development, particularly for resource-constrained organizations.
Consensus-Driven Development
CIS benchmarks are developed through collaborative processes involving security practitioners, government agencies, vendors, and researchers. This consensus approach ensures recommendations reflect current threat landscapes, practical implementation experience, and diverse organizational perspectives. Regular updates incorporate emerging threats and evolving attack techniques.
Real-World Applications
Enterprise Security Programs
Large organizations use CIS Controls as a framework for building comprehensive security programs. Security architects map existing security initiatives to CIS Controls, identify gaps, and develop roadmaps for improvement. Many enterprises adopt CIS Controls as organizational security standards that all departments and systems must follow.
System Hardening
System administrators and security teams use CIS Benchmarks to configure new systems and audit existing infrastructure. Automated CIS-CAT scans regularly assess compliance, identifying when systems drift from secure baselines. Organizations remediate findings through configuration management and patch deployment processes.
Third-Party Risk Management
Organizations often require suppliers, contractors, and service providers to comply with CIS Controls or implement CIS Benchmarks on systems handling sensitive data. CIS compliance becomes a contractual requirement and audit point in vendor management programs.
Incident Response and Forensics
Following security incidents, organizations use CIS Controls to guide remediation efforts and strengthen defenses against similar attacks. Post-incident reviews often identify which CIS Controls would have prevented or mitigated specific compromises.
Implementation Considerations
Phased Approach
Organizations typically adopt CIS Controls and Benchmarks progressively rather than attempting comprehensive implementation simultaneously. Many start with IG1 controls, then advance to IG2 and IG3 as organizational maturity increases. This phased approach manages implementation complexity and maintains operational continuity.
Environmental Customization
While CIS Benchmarks provide comprehensive guidance, organizations must tailor recommendations to their specific technical environment, business requirements, and threat model. Some recommendations may require modification for legacy systems or operational constraints. Security teams document rationales for any deviations from standard benchmarks.
Tool Integration
Organizations integrate CIS assessment tools with configuration management systems, security information and event management (SIEM) platforms, and vulnerability management solutions. Automation enables continuous compliance monitoring and rapid identification of security degradation.
Industry Recognition
CIS Controls are widely recognized by security professionals, government agencies including CISA (Cybersecurity and Infrastructure Security Agency), and industry experts as foundational security guidance. Multiple security certifications reference or align with CIS Controls, and many organizations prioritize CIS compliance in security job descriptions and training programs.
Note: CIS resources are primarily free and publicly available, making them accessible even to resource-limited organizations. Premium CIS-CAT Pro tools and consulting services provide additional automation and professional support for larger enterprises.