How quickly should I apply security patches?

ACSC Essential Eight recommends patching critical vulnerabilities within 48 hours. For exploited-in-the-wild vulnerabilities, patch as fast as possible (same day if feasible). Non-critical patches should be applied within two weeks. Prioritise internet-facing systems and those handling sensitive data.

How do I patch without breaking things?

Implement a testing process: apply patches to a test environment first, verify critical functionality, then deploy to production in waves (start with a small group, expand if no issues). Maintain rollback capability for every patch deployment. Automated testing reduces the time needed for validation.

What about legacy systems that cannot be patched?

For systems that cannot be patched: isolate them on a separate network segment, implement additional compensating controls (firewalls, monitoring, access restrictions), document the risk and mitigation measures, plan for replacement or migration, and increase monitoring for those systems. Never leave unpatched systems on the general network.

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Patch Management

Also known as:software updates managementsecurity patchingupdate management

The process of identifying, acquiring, testing, and installing software updates (patches) to fix security vulnerabilities, bugs, and improve functionality across all systems and applications.

In-Depth Explanation

Patch management is the systematic process of keeping all software -- operating systems, applications, firmware, and drivers -- up to date with security fixes and improvements. It is a critical security control, as many cyberattacks exploit known vulnerabilities that patches have already fixed.

Patch management process:

Discovery: Inventory all software and systems in the environment
Assessment: Identify available patches and their criticality
Prioritisation: Rank patches by risk (critical vulnerabilities first)
Testing: Test patches in a staging environment before production
Deployment: Roll out patches to production systems
Verification: Confirm patches installed correctly
Documentation: Record what was patched and when

Patch categories:

Security patches: Fix vulnerabilities (highest priority)
Critical updates: Fix severe bugs or stability issues
Feature updates: Add new functionality
Firmware updates: Update device-level software
Driver updates: Update hardware communication software

Patch management challenges:

Volume of patches across multiple systems and applications
Testing patches without breaking production systems
Coordinating patches with maintenance windows
Legacy systems that cannot be easily patched
Remote devices not always connected to the network
Third-party application patching
Patch compatibility issues

Patch management tools:

WSUS/SCCM/Intune: Microsoft patching for Windows environments
Jamf: macOS and iOS patch management
Automox: Cloud-native patch management
ManageEngine: Multi-platform patch management
Ivanti: Comprehensive patch and vulnerability management

ACSC Essential Eight patching recommendations:

Patch applications within 48 hours for critical vulnerabilities
Patch operating systems within 48 hours for critical vulnerabilities
Use automated patch management where possible
Target two weeks for non-critical patches

Business Context

60% of data breaches involve unpatched vulnerabilities. Maintaining current patches across all systems is one of the most effective and cost-efficient security measures, yet many businesses fall behind due to operational challenges.

How Clever Ops Uses This

Clever Ops implements automated patch management for Australian businesses, ensuring operating systems, applications, and firmware stay current with security updates. We configure automated patching schedules, testing procedures, and compliance reporting aligned with ACSC Essential Eight maturity targets.

Example Use Case

"An Australian business implements Automox for automated patch management across 200 Windows and Mac devices, achieving 98% patch compliance within 48 hours for critical updates, up from a previous average of 45 days."