Essential Eight: Your Quick Guide for IT Security

The Essential Eight is Australia’s baseline cyber security framework, designed to reduce the most common cyber risks organisations face. If you’re responsible for systems, users, or operations, understanding the Essential Eight helps you prioritise security work that actually moves the needle.

If you’re wondering where your organisation stands, talk to our team about an Essential Eight readiness check or uplift roadmap.

What the Essential Eight Is and Why It Exists

The Australian Cyber Security Centre (ACSC) developed the Essential Eight to help organisations focus on the most effective cyber controls. Rather than chasing every shiny new security tool, it’s about implementing eight key measures that stop attackers in their tracks.

In plain terms, it answers one question:

“If we only do a few things well, what should they be?”

Essential Eight controls explained

Below is a short, practical explanation of each control and what it usually looks like day to day.

1. Application control

Only approved applications are allowed to run. This limits malware and unauthorised tools.

In practice:

• Blocking unknown executables
• Preventing users from running random installers
• Using allow‑lists where feasible

2. Patch applications

Applications are patched quickly when security updates are released.

In practice:

• Browsers, PDF readers, Java, and line‑of‑business apps updated regularly
• Clear ownership for patching, not “best effort”

3. Patch operating systems

Operating systems are kept up to date with security patches.

In practice:

• Supported versions of Windows, macOS, Linux
• Patching aligned to a defined schedule, not ad hoc

4. Configure Microsoft Office macro settings

Macros from the internet are blocked or restricted.

In practice:

• Internet‑sourced macros disabled
• Legitimate macros allowed only where genuinely required

5. User application hardening

Applications are configured to reduce exposure to common attacks.

In practice:

• Disabling Flash (where still present)
• Blocking ads and unnecessary scripting
• Hardening browsers and email clients

6. Restrict administrative privileges

Admin access is limited to what’s required and nothing more.

In practice:

• Separate admin accounts
• No permanent admin rights “just in case”
• Admin access reviewed regularly

7. Multi‑factor authentication (MFA)

A second factor is required in addition to a password.

In practice:

• MFA on Microsoft 365, VPNs, remote access
• Stronger controls for privileged users
• Avoiding SMS where better options exist

8. Regular backups

Data is backed up and can actually be restored.

In practice:

• Backups taken regularly
• Stored separately from production systems
• Restore tests performed, not assumed

Understanding Essential Eight Maturity Levels

The Essential Eight uses maturity levels to recognise that not every organisation starts in the same place.

Maturity Level 0

• Controls are largely ad hoc or missing
• High likelihood of preventable incidents

Maturity Level 1

This is where most organisations should aim first.

In practice, Level 1 usually means:

• Known vulnerabilities are patched in a reasonable timeframe
• MFA is enabled for key services
• Admin rights are limited and visible
• Backups exist and have been tested at least once

It’s not perfect security. It’s consistent, repeatable basics done properly.

Maturity Levels 2 and 3

These build on Level 1 with:

• Faster patching timeframes
• Broader coverage
• Stronger controls for privileged access
• More rigorous monitoring and testing

For many SMEs and mid‑market organisations, Level 1 delivers the biggest risk reduction for the least complexity.

Common Essential Eight Gaps We See

Across ICT teams we work with, the same gaps come up again and again.

Patching cadence is unclear

• Updates rely on monthly reminders
• Third‑party apps are forgotten
• No visibility into what’s actually patched

If you’re already using managed patching or vulnerability tools, this often improves quickly.

MFA is only partially deployed

• Enabled for email but not VPNs
• Admin accounts exempt “temporarily”
• Legacy authentication still enabled

We often see this alongside older Azure AD (now Entra ID) configurations. If this sounds familiar, our post on disabling legacy authentication is a useful next read.

Backups exist but aren’t tested

• Backups are running, but restores haven’t been verified
• No one is sure how long recovery would take
• Backups are accessible from the same environment

A backup that hasn’t been tested is a hope, not a control.

Admin access has grown quietly

• Temporary access never removed
• Shared admin accounts still in use
• No regular review process

This is rarely malicious. It’s usually the result of time pressure and growth.

Getting Essential Eight Ready for Your Organisation

A practical approach that works for most IT teams:

1. Conduct a gap assessment against the Essential Eight controls
2. Prioritise high-impact items like patching and MFA
3. Implement controls progressively, aiming for Level 2 coverage as a baseline
4. Document processes and review regularly
5. Train staff on key security practices (security awareness training)

Conclusion

The Essential Eight isn’t just a checklist – it’s a practical roadmap for reducing cyber risk. By understanding the controls, assessing your maturity, and addressing common gaps, IT leaders can protect their organisation without chasing every trend.

If you’re unsure where to start, get in touch about our readiness check to see where your team stands and create a clear plan for uplift.

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