Level 1 is a baseline set of security recommendations that can usually be applied quickly with limited disruption. Level 2 is more rigorous and is intended for environments that handle highly sensitive data. It typically requires more planning, change management, and subject matter expertise, but it also aligns more closely with demanding regulatory expectations.
What Level 1 and Level 2 actually mean in CIS Benchmarks
Level 1 and Level 2 are both hardening guidance within the CIS Benchmark model, but they serve different operational assumptions. Level 1 is the safer starting point for broad deployment, while Level 2 is the stricter profile for systems that justify tighter security and can tolerate more configuration change. The difference is not just “more controls”, it is also a difference in acceptable operational friction.
Level 1 usually focuses on settings that improve security without demanding deep redesign, unusual dependencies, or heavy tuning. Level 2 typically goes further into restrictive settings, stronger reduction of attack surface, and controls that may break legacy behavior, so it is better suited to high-value or highly sensitive environments where security benefit outweighs implementation cost.
That distinction matters because a benchmark level is not a maturity score. It is a deployment profile. An organisation can be well managed and still choose Level 1 for some systems because availability, compatibility, or vendor support is the higher priority, while using Level 2 for others where the risk profile justifies it.
How the two levels differ in practice
Level 1 is usually the baseline most teams can apply with limited disruption. It is designed to be broadly achievable, easier to operationalise, and more likely to fit into standard build, patch, and configuration workflows. If you need a repeatable hardening standard across many systems, Level 1 is often the common denominator.
Level 2 is more demanding. It generally assumes the environment can absorb stricter settings, more exceptions, and more validation after changes. That means teams often need change testing, application owner input, and rollback planning before adopting it. CIS Benchmarks are structured so practitioners can move from a pragmatic baseline to a stricter posture when the system and business context support it.
The practical difference is often seen in the kinds of systems each level fits best. Level 1 is usually appropriate for general enterprise endpoints, mixed application estates, and platforms where compatibility is a concern. Level 2 is more appropriate where the platform is dedicated, tightly governed, and supporting higher consequence data or functions.
How to choose between them without over-hardening
Selection should be driven by data sensitivity, system criticality, and tolerance for operational change. If the environment is business-critical but fragile, Level 1 may be the correct starting point even if the security team would prefer more. If the system holds sensitive data, is tightly controlled, or is already supported by strong change management, Level 2 becomes more realistic.
The best decision rule is to match the benchmark level to the system’s recovery and compatibility profile. If a control causes a material service break or unsupported configuration, it is not a good candidate for blanket rollout. If the system can be tested, monitored, and recovered quickly, the stricter profile becomes more attractive because the security gain is less likely to be offset by operational harm.
Level 2 is also a better fit when the organisation needs evidence of stronger hardening for regulatory, audit, or contractual reasons. That does not mean every control must be pushed to the strictest setting everywhere. It means the environment must be able to justify the stronger baseline with evidence that it can remain stable after hardening.
Risk and Threat Considerations
The main risk is treating Level 2 as a universal default. Stricter settings can reduce attack surface, but they can also introduce outage risk, application breakage, or exception sprawl if they are applied without testing. The reverse risk is more common: staying at Level 1 everywhere can leave sensitive systems under-hardened relative to their exposure.
Failure mechanism: Teams either over-apply Level 2 to systems that cannot tolerate it, creating operational failures, or under-apply it to high-sensitivity systems, leaving unnecessary exposure and weaker containment against misconfiguration and attacker abuse.
Impact: Over-hardening can cause avoidable outages and rollback events; under-hardening can preserve weak settings that make privilege abuse, lateral movement, and configuration-based compromise easier.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8 and NIST CSF 2.0 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-5 — Account Management | Benchmarks levels are hardening and configuration baselines for reducing exposure. |
| Recommendation — Apply CIS-5 to standardize hardening baselines and limit unnecessary access across systems. | ||
| NIST CSF 2.0 | PR.PS-01 — Configurations are managed consistent with policy and technical requirements | The question is about different hardening baselines and stricter configuration profiles. |
| Recommendation — Manage baseline configurations so higher-hardening profiles are tested and rolled out consistently. | ||
| ISO/IEC 27001:2022 | A.8.9 — Configuration management | CIS Benchmark levels are configuration hardening profiles that need controlled implementation. |
| Recommendation — Use configuration management to approve, test, and track benchmark-level changes. | ||
Practitioner Guidance
What to prioritise: Classify systems by sensitivity and operational tolerance before selecting a level. A benchmark level should follow the system’s business role, not the team’s preference for stricter language.
What to verify: Confirm that the candidate Level 2 settings have been tested against the actual application stack, vendor support position, and recovery process. If the control cannot be validated safely, it should not be treated as a low-risk change.
Practitioner takeaway: Level 1 is the practical baseline, but Level 2 is the better security fit only when the environment can absorb the added rigidity without unacceptable operational cost.
Related resources from NHI Mgmt Group
- What is the difference between attack surface management and NHI governance?
- What is the difference between reviewing human access and reviewing NHIs?
- What is the difference between role-based access and API key governance for NHI security?
- What is the difference between human IAM controls and NHI governance?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
