Cloudflare’s enterprise-class web application firewall (WAF) protects your Internet property from common vulnerabilities like SQL injection attacks, cross-site scripting, and cross-site forgery requests with no changes to your existing infrastructure.
Cloudflare sees roughly 2.9 million requests every second and our WAF is continually identifying and blocking new potential threats.
Cloudflare security engineers constantly monitor the Internet for new vulnerabilities. When we find threats that apply to a large portion of our users, we automatically apply WAF rules to protect their Internet properties. Let us take care of tracking state-of-the-art hacking techniques so you can focus on creating useful features instead of protecting them from would-be attackers.
On-premise firewalls quickly become outdated and require professional service hours to regularly update rules to protect against new threats. Cloudflare’s WAF helps you stay ahead of threats by automatically updating when new security vulnerabilities are released.
Cloudflare sees roughly 2.9 million requests every second, and our WAF is continually identifying and blocking new potential threats. If you’re using a web application firewall that doesn’t leverage the collective intelligence of other web properties, you need to supply all your own WAF rules from scratch, which means you need to monitor the entire Internet security landscape on your own.
When one customer requests a new custom WAF rule, we analyze whether it applies to all 6 million domains on our network. If it does, we automatically apply that rule to everybody on our network. The more web properties on our network, the stronger our WAF gets, and the safer the Cloudflare community becomes.
At Cloudflare, we’re just as concerned with performance as with security. Our web application firewall sits on the same Anycast network that powers our global CDN, HTTP/2, and web optimization features. Our WAF rule sets result in latency of less than 1 millisecond.
Utilizing Cloudflare’s WAF helps you cost effectively fulfill PCI compliance. If you’re a merchant who handles consumer credit card information, PCI DSS 2.0 and 3.0 Requirement 6.6 allows for two options to meet this requirement:
Cloudflare’s WAF protects your web properties from the OWASP top 10 vulnerabilities by default. These OWASP rules are supplemented by 148 built-in WAF rules that you can apply with the click of a button. Business and Enterprise customers can also request custom WAF rules to filter out specific attack traffic.
Cloudflare security engineers have dealt with a lot of zero-day vulnerabilities over the years. Read our developer blog to learn how every website on our network benefits from their virtual patches.
A vulnerability in the XML remote procedure protocol allowed potentially thousands of brute force password attempts in a single HTTP request. Read more ›
The Joomla Unserialize Vulnerability allowed remote code execution via a poorly sanitized User-Agent and X-Forwarded-For headers. Read more ›
Cloudflare WAF protected users from a critical bug that allowed unpriviledeged users to hang a Windows web server. Read more ›
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Cloudflare WAF supports the OWASP ModSecurity Core Rule Set by default, as well as the following application-specific rule sets:
You can enable entire rule sets or select individual rules that you want to apply to your website. For content management systems that use an admin interface, it’s possible to create a Cloudflare Page Rule to apply stronger WAF rules to your admin section.
Business and Enterprise customers can request custom WAF rules by providing attack traffic logs and suggesting the appropriate mod_security rule syntax.
Cloudflare WAF also includes an IP firewall that lets you whitelist or blacklist traffic based on IP address, IP ranges, Autonomous System Number (ASN), or country (including Tor).