How fast should I apply security patches?
Apply critical patches within days and others weekly to meet security standards like PCI DSS while keeping your application stable through regular testing.
Apply critical patches within days to address active exploits and update all other components weekly to meet industry standards and maintain application stability.
Prioritise critical vulnerabilities
Start with patches for vulnerabilities that are being actively exploited in the wild. You can identify these by checking the CISA Known Exploited Vulnerabilities catalogue, which lists the flaws that attackers are currently using. These updates require your immediate attention because they represent a direct risk to your production environment. Aim to apply these fixes within a few days of their release to maintain a strong security posture.
Meet industry compliance standards
Regulatory frameworks provide clear timelines for when you must update your software. PCI DSS 6.3.3 expects you to install critical security patches within one month of their release, which is a useful benchmark even if you do not handle payments. Following these guidelines ensures that you are meeting professional expectations for data protection. It also helps you prepare for future audits by establishing a predictable rhythm for maintenance.
Establish a weekly update cycle
Routine patches for less severe issues should be handled on a consistent schedule to avoid emergency deployments. If you set aside time every week to review and apply updates, you prevent a backlog of technical debt from accumulating. This approach allows you to group several small changes together, which makes the testing process more efficient. Regular maintenance is more effective than waiting for a major security event.
Test and record your changes
Always deploy patches to a staging environment before they reach your users so you can verify that nothing has broken. Once you are confident the update is stable, move it to production and log the date the patch was applied. Keeping a record of these actions is essential for demonstrating compliance with ISO 27001 Annex A control 8.8, which covers the management of technical vulnerabilities. This documentation proves that you are following a professional maintenance routine.
What to do
- Identify exploited flaws using the KEV list
- Apply critical patches within one month
- Schedule routine updates every week
- Log all deployments for compliance records.
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