What Is CIS?
The Center for Internet Security (CIS) is a nonprofit organization that develops best-practice cybersecurity standards used globally across public and private sectors.
CIS is best known for the CIS Benchmarks, which provide detailed, prescriptive guidance for securely configuring operating systems, cloud platforms, databases, and applications. These benchmarks are widely referenced by auditors, regulators, and security teams as a practical standard for system hardening.
Why It Matters
CIS Benchmarks are often used as the technical baseline for security and compliance programs. They are referenced directly or indirectly by frameworks such as NIST, PCI DSS, FFIEC, HIPAA, and CMMC.
Assessors rely on CIS Benchmarks because they translate abstract security requirements into concrete, testable configuration settings. When systems drift from these baselines or configurations are applied inconsistently, organizations struggle to prove control effectiveness.
Teams that rely on manual scripts or one-time hardening efforts often fail to maintain alignment as systems change over time.
What It Requires
CIS Benchmarks define specific configuration recommendations designed to reduce attack surface and strengthen system security. Common expectations include:
- Secure baseline configurations: Apply hardened settings based on CIS Benchmarks
- Least functionality: Disable unnecessary services, ports, and features
- Account and access controls: Restrict privileged access and default accounts
- Logging and auditing: Enable and protect audit logs
- Configuration consistency: Apply settings uniformly across systems
- Ongoing validation: Continuously verify configurations remain compliant
Because CIS is prescriptive, deviations from benchmarks must be documented, justified, and managed.
CIS Implementation Guidance
Organizations using CIS Benchmarks should be able to demonstrate the following:
☐ CIS Benchmarks are selected and documented for in-scope systems
☐ Hardened configurations are enforced, not just recommended
☐ Deviations from benchmarks are approved and tracked
☐ Configuration changes are logged and auditable
☐ Systems are monitored for configuration drift
☐ Access to configuration settings is restricted
☐ Evidence is available for audits and assessments
☐ Baselines are reviewed as benchmarks are updated
How to Use CIS Benchmarks Effectively
Applying CIS Benchmarks once is not enough. Systems change, configurations drift, and exceptions accumulate.
To use CIS effectively:
- Select the appropriate benchmark and profile for each system
- Enforce hardened settings consistently across environments
- Monitor continuously for unauthorized changes
- Review benchmark updates and adjust baselines accordingly
- Maintain documentation for approved deviations
Automation is key to sustaining CIS alignment without operational disruption.
CalCom is a CIS Certified Benchmark Tool
CalCom Hardening Suite is certified by the Center for Internet Security to assess and enforce system configurations aligned with CIS Benchmarks.
CalCom Hardening Suite (CHS) helps organizations implement and maintain CIS Benchmarks without relying on manual scripts or disruptive hardening efforts.
With CHS, you can:
- Enforce CIS-aligned hardened baselines across servers and environments
- Detect and remediate configuration drift automatically
- Preview the operational impact of benchmark settings before deployment
- Maintain full audit trails for configuration changes
- Generate compliance evidence mapped to CIS recommendations
CalCom helps ensure CIS Benchmarks are continuously enforced, not just applied once and forgotten.
