CIS Cloud Benchmarks: AWS vs Azure vs GCP vs OCI Compared

CIS publishes Foundations-style Benchmarks for major clouds so organisations can harden account/tenant baselines consistently. Searching for a single winner score across AWS, Azure, Google Cloud, and Oracle Cloud Infrastructure (OCI) usually leads to fabricated league tables.

This comparison is structural and operational: shared themes, how each hyperscaler exposes native assessment, and how to run a multi-cloud CIS programme without fake percentages.

No fake scores: We avoid publishing "AWS 92 / Azure 88" style rankings. Pass rates depend on your landing zones, exceptions, and which CIS edition you assess. Compare programmes on coverage, evidence quality, and operating cadence instead.

What all four Foundations benchmarks share

Despite different service names, Foundations packs repeatedly emphasise:

Identity and privileged access baselines
Logging / monitoring enablement at the organisation or tenancy level
Network exposure and segmentation defaults
Storage / key-management protective settings
Level 1 vs Level 2 style profiles (where the edition provides them)

Each cloud also has service-specific CIS Benchmarks (Kubernetes engines, Linux images, databases). Foundations is the account/tenant hygiene layer — not the whole CIS catalogue.

By cloud: benchmark focus and native assessment

AWS — CIS AWS Foundations

Focus: Account security baselines spanning IAM, CloudTrail/Config logging patterns, VPC networking expectations, and storage-related guards reflected in the current CIS edition.

Native assessment: AWS Security Hub CIS AWS Foundations standard (Config-backed controls), optionally complemented by Security Hub other standards and Inspector/Config packs. See enabling CIS in Security Hub.

Watch-outs: Multi-Region enablement gaps; mistaking Foundations pass for EKS/Amazon Linux hardening complete.

Microsoft Azure — CIS Azure Foundations

Focus: Subscription and Entra-aligned configuration themes across identity, network, logging, and data services as defined in the CIS Azure Foundations Benchmark.

Native assessment: Built-in Azure Policy initiatives plus Microsoft Defender for Cloud regulatory compliance views. See Azure Policy and Defender for Cloud.

Watch-outs: Initiative version vs CIS PDF drift; Deny effects applied before landing zones are ready.

Google Cloud — CIS GCP Foundations

Focus: Organisation / folder / project baselines — identity and access, resource hierarchy, networking (VPC/firewall themes), logging/monitoring (Cloud Logging / Cloud Monitoring patterns), and storage protective settings per the CIS GCP Foundations edition.

Native assessment: Security Command Center (SCC) posture / findings experiences that surface CIS-related detectors depending on SCC tier and configuration, plus Policy Controller / organisation policy constraints for preventive guardrails. Details evolve with Google Cloud product naming — verify in current Google docs and your CIS PDF.

Watch-outs: Org-policy constraints are preventive; SCC findings are detective — you usually need both. See also CIS GCP Foundations in Security Command Center.

Oracle Cloud Infrastructure — CIS OCI Foundations

Focus: Tenancy and compartment baselines covering IAM, networking (VCN/security lists/NSGs), logging, object storage, and related Foundations themes in the CIS OCI Benchmark edition you adopt.

Native assessment: Oracle Cloud Guard problems/detectors and Security Zones (preventive recipes) are the usual native pair; CIS assessment procedures in the workbook remain authoritative for formal scoring.

Watch-outs: Smaller ecosystem of third-party blog commentary than AWS/Azure — lean harder on the CIS PDF and Oracle documentation rather than secondary checklists.

Comparison matrix (capabilities, not scores)

Dimension	AWS	Azure	GCP	OCI
Foundations benchmark	CIS AWS Foundations	CIS Azure Foundations	CIS GCP Foundations	CIS OCI Foundations
Typical native detective surface	Security Hub + Config	Policy + Defender for Cloud	Security Command Center (+ org policy)	Cloud Guard (+ Security Zones)
Org hierarchy unit	Organizations / OUs / accounts	Management groups / subscriptions	Org / folders / projects	Tenancy / compartments
Common multi-cloud gap	Region sprawl	Initiative vs PDF drift	Tier/feature entitlements for SCC	Less commodity tooling depth

Use this table for architecture conversations. Do not convert rows into invented numeric rankings.

Designing a multi-cloud CIS programme

One GRC library, many packs: Store each cloud's CIS edition string, profile, and native standard/initiative version.
Landing-zone first: Fix org-level logging and identity wiring before chasing per-resource fails.
Exception taxonomy shared: Same fields (owner, expiry, compensating control) across clouds even when tools differ.
No rolled-up vanity score: Report per-cloud pass/fail and ageing exceptions; executives can still see trends without a fake composite index.
Service benchmarks next: After Foundations is stable, add Kubernetes, OS, and database CIS packs that match your runtime footprint.

Where CyberSilo helps without claiming a universal score

CyberSilo CIS Benchmarking Tool messaging is about consistent assessment and remediation tracking across heterogeneous estates. CSA keeps evidence and crosswalks for ISO, SOC 2, PCI, and regional frameworks next to CIS artefacts. ThreatHawk watches for the operational symptoms of drift when a console still looks green.

How CyberSilo Helps

Evidence mapping in CyberSilo CSA
Detection and logging proof with ThreatHawk SIEM
Advisory scoping — contact CyberSilo

Run multi-cloud CIS evidence in one place

CyberSilo CSA and ThreatHawk help you organise Foundations evidence across AWS, Azure, GCP, and OCI without fake composite scores.

Talk to CyberSilo CIS Benchmarking Tool

Frequently Asked Questions

Which cloud's CIS Foundations is "best"?

None universally. Fit depends on your primary cloud, native tooling maturity, and how well your landing zone encodes defaults. Compare programmes — not invented scores.

Can one scanner replace all four native tools?

Sometimes a third-party multi-cloud scanner helps, but native Security Hub / Azure Policy / SCC / Cloud Guard still matter for cloud-specific APIs and remediation. Expect a small toolchain.

Do Foundations benchmarks include Kubernetes?

Not as a full substitute. Use the dedicated CIS Benchmarks for EKS, AKS, GKE, OKE, or upstream Kubernetes as applicable.

How often should we re-compare editions?

Whenever CIS publishes an edition you adopt, and when a hyperscaler changes its built-in standard/initiative mapping — at least review annually.

CIS Cloud Benchmarks: AWS vs Azure vs GCP vs OCI Compared

What all four Foundations benchmarks share