Vercel WAF

The Vercel WAF, part of the Firewall, provides security controls to monitor and control the internet traffic to your site through logging, blocking and challenging. When you apply a configuration change to the firewall, it takes effect globally within 300ms and can be instantly rolled back to prior configurations.

• Configure your first Custom Rule
• Add IP Blocks
• Explore WAF Managed Rulesets

You can control the internet traffic to your website in the following ways:

• IP blocking: Learn how to configure IP blocking
• Custom rules: Learn how to configure custom rules for your project
• Managed rulesets: Learn how to enable managed rulesets for your project (Enterprise plan)

You can quickly revert to a previous version of your firewall configuration. This can be useful in situations that require a quick recovery from unexpected behavior or rule creation.

To restore to a previous version:

1. From your dashboard, select the project you'd like to configure, then open Firewall in the sidebar
2. Select the View Audit Log option by clicking on the ellipsis menu at the top right
3. Find the version that you would like to restore to by using the date and time selectors
4. Select Restore and then Restore Configuration on the confirmation modal

Depending on your plan, there are limits for each Vercel WAF feature.

• For Account-level IP Blocking, CIDR rules are limited to /16 for IPv4 and /48 for IPv6
• For Custom Rule Parameters, JA3 (Legacy) is available on Enterprise plans