Top 6 Free WAF solutions for websites in 2026

1. Why should businesses consider a free WAF?

In practice, automated attack tools continuously scan large numbers of websites to exploit vulnerabilities, regardless of business size. According to the VNETWORK 2025 Cybersecurity Report, more than 2.3 million cyberattacks occurred, with SMEs being the primary targets of methods such as SQL Injection, XSS, and malicious bots.

To address this risk, a Web Application Firewall (WAF) acts as a control gateway for all traffic before it reaches the origin server. Because it operates at the application layer (Layer 7), a WAF can inspect the content of every HTTP request to block sophisticated attacks. Integrating a free WAF allows businesses to establish a basic security layer for their website right away, without budget pressure.

2. Common types of free WAF solutions today

Before comparing specific solutions, it is important to understand the three groups of free WAFs currently available on the market. Each group differs in deployment model, level of customization, and target audience.

• Open source (self hosted): deployed directly on the business's own server. Features are unlimited since the source code is fully open, but an experienced technical team is required to install it, configure rules, and maintain the system over time.
• Cloud, ready made services: deployed quickly by pointing DNS or signing up for an account, with no need to access the server. This suits businesses that want immediate protection, although the free tier usually limits the ability to create custom rules.
• WordPress plugins: installed directly on the WordPress platform, easy to use for non technical users, but limited to WordPress websites, and some plugins have delayed rule updates in their free tier.

3. Criteria for evaluating a free WAF solution

Not every free WAF solution suits every business's needs. When choosing one, businesses should consider the following four key criteria:

• Level of protection: the ability to effectively block common cyberattack threats, particularly vulnerabilities on the OWASP Top 10 list such as SQL Injection, XSS, and others.
• Ease of deployment: whether the system can be activated quickly or requires a dedicated technical team for installation and day to day management.
• Limitations of the free tier: it is important to check whether the free version restricts traffic volume, the ability to create custom protection rules, or the speed of new patch updates.
• Support and scalability: whether the provider offers assistance when issues arise, and whether the system can easily be upgraded to higher tiers as the business grows.

4. Top 6 free WAF solutions worth using in 2026

Below are the six most notable free WAF solutions available today, representing all three categories, open source, cloud, and WordPress plugins, mentioned above.

4.1 WAF Free VNETWORK

VNETWORK is a security technology company with more than 13 years of experience, currently serving over 2,000 domestic and international enterprise customers across sectors such as VTV, TikTok, Momo, VieOn, HSC, FireAnt, CellphoneS, VOV, and VPS. WAF Free VNETWORK is a free web application firewall solution developed by VNETWORK, delivered as a cloud service so businesses do not need to invest in servers or a dedicated operations team; simply signing up is enough to activate protection right away.

The platform is built on years of experience handling attacks and protecting infrastructure for Vietnamese businesses, with AI at its core from design through operation, continuously learning from real world attack data to filter threats more accurately over time. As part of VNETWORK's WAAP ecosystem, the product delivers practical benefits that help businesses protect their website from day one of deployment:

• Free to use: activate instantly, with absolutely no hidden costs.
• Easy integration: simple setup in just 2 minutes, requiring no in depth technical knowledge.
• Comprehensive protection: effectively blocks OWASP Top 10 vulnerabilities and defends against DDoS threats, keeping the website running stably.
• Faster access speed: optimizes Web/App content delivery performance and improves user experience through an extensive CDN infrastructure.
• Intuitive monitoring: provides a dashboard for tracking traffic in real time.
• Compliance support: meets the WAF requirement set out in Decree 85/2016/ND-CP.

In terms of infrastructure, WAF Free VNETWORK runs on a server system located entirely within Vietnam. This provides a significant advantage for businesses whose users are concentrated domestically, helping to optimize transmission latency, ensure fast access speeds, and keep user connections stable.

Built by a Vietnamese technical team, the solution has a deep understanding of the local cybersecurity landscape and the real needs of domestic businesses. Businesses receive direct technical support in Vietnamese 24/7, rather than relying on English language documentation or communities as with international solutions. Choosing a local solution provides the safest, fastest, and most suitable foundation for Vietnamese businesses.

See the Free WAF Activation Guide to protect your website in just 3 steps!

4.2 ModSecurity (OWASP CRS)

ModSecurity, combined with the OWASP Core Rule Set, is a widely used open source WAF solution that runs on both Apache and NGINX. The CRS ruleset has been continuously maintained by the security community for many years and provides solid coverage of common application layer vulnerabilities.

• Completely free, with no feature limitations since it is open source
• The CRS ruleset is continuously updated by the security community
• Best suited for teams that already have the technical expertise to install, configure, and fine tune rules to fit each system's specific needs

4.3 Cloudflare (Free Plan)

Cloudflare offers a free plan that includes a ready made, managed WAF ruleset; simply pointing DNS to Cloudflare activates protection without needing server access. The plan also includes basic DDoS protection and a CDN.

• Deploys quickly within minutes, requiring no actions on the server
• Comes with a managed ruleset covering common vulnerabilities
• Suitable when the standard, ready made ruleset is sufficient and there is no need yet to customize rules for a business's specific traffic patterns

4.4 Wordfence

Wordfence is a widely installed WordPress security plugin that provides an application firewall aware of WordPress specific context, such as login sessions and active plugin status.

• The firewall understands WordPress context rather than simply filtering raw traffic
• Includes malware scanning and two factor authentication
• Suitable for WordPress websites with low to medium risk levels that do not require an immediate response to newly discovered vulnerabilities

4.5 SafeLine

SafeLine is an open source WAF solution that uses semantic analysis of requests rather than simply matching known attack patterns, helping to reduce the rate of false positives on legitimate traffic.

• The community edition includes a full WAF engine and an intuitive management interface
• The semantic analysis approach allows for more flexible attack detection
• Suitable for teams capable of self managing infrastructure and reading technical documentation in English

4.6 NinjaFirewall

NinjaFirewall is a WordPress plugin that works by inserting itself into the PHP execution process before WordPress loads, allowing it to block malicious requests earlier in the processing lifecycle compared to many other plugins.

• Rules are updated almost instantly, even in the free version
• Lighter weight than some other WordPress security plugins
• Suitable for single, small to medium WordPress websites that do not yet need a broader security ecosystem beyond WordPress

5. Quick comparison table of 6 free WAF solutions

6. Which free WAF should businesses choose?

Choosing the right free WAF solution is not simply about the international scale of the provider's brand; more importantly, it comes down to how well the provider understands the local cybersecurity landscape, how quickly it responds when incidents occur, and its ability to scale in the future.

In practice, open source tools are strong in customization but place significant pressure on operational resources. Plugins dedicated to WordPress are convenient but limited to a single platform. Meanwhile, international cloud services deploy quickly but often run into language barriers and time zone differences when urgent technical support is needed.

For Vietnamese businesses, particularly SMEs without a dedicated information security team, the challenge goes beyond cost optimization. The more important question is: “When something goes wrong with the system, who is truly there to help?”

This is exactly why WAF Free VNETWORK stands out as a top choice. The solution fully meets core technical standards such as blocking OWASP Top 10 vulnerabilities and reducing DDoS risk, while also offering a distinct advantage through infrastructure optimized for Vietnam and a team of experts providing direct support in Vietnamese. As a result, businesses can operate with complete peace of mind, without having to trade off between performance, cost, and service quality.

7. Conclusion

For businesses seeking a solution that requires no dedicated technical team, deploys in about 2 minutes, blocks vulnerabilities, defends against DDoS, and comes with a built in CDN to speed up the website, WAF Free VNETWORK is worth starting with today. The product is operated by a Vietnamese team with more than 13 years of security experience, offering direct support in Vietnamese whenever needed, so businesses can operate with confidence and without hidden costs.

Sign up for WAF Free VNETWORK today to protect your website for free, quickly, and with the support of a team that truly understands the context of Vietnamese businesses!

FAQ, Frequently Asked Questions About Free WAF

1. Is WAF Free VNETWORK really free forever, or is it just a trial version?

WAF Free VNETWORK is a long term free plan, not a time limited trial. Businesses can use it continuously with no hidden costs, and only need to consider upgrading to a paid plan within the WAAP ecosystem if they want additional advanced protection features.

2. Does installing WAF Free VNETWORK slow down website loading speed?

WAF Free VNETWORK comes with a built in CDN, so instead of slowing the website down, it actually improves page load speed, since content is delivered through points of presence closer to users rather than loading directly from the origin server.

3. Is a free WAF enough to protect an e commerce website?

A free WAF can protect an e commerce website from common attacks such as SQL injection or XSS, but if the website must comply with strict payment security standards, businesses should also consider features such as compliance reporting, priority technical support, and deeper rule customization, which are usually only available in paid plans.

4. Does WAF Free VNETWORK ever block real customers by mistake (false positives)?

WAF Free VNETWORK applies AI to analyze access behavior rather than simply matching rigid rules, significantly reducing the rate of false positives on legitimate traffic compared to solutions that rely solely on static rulesets. If a false positive does occur, VNETWORK's Vietnamese support team can help adjust it directly.

5. Can a website already using WordPress run WAF Free VNETWORK alongside its current security plugin?

Yes. WAF Free VNETWORK operates at the network layer, filtering traffic before requests reach the server, while WordPress security plugins such as Wordfence or NinjaFirewall operate at the application layer within WordPress. Combining both layers strengthens overall defense without causing conflicts.

6. When should businesses upgrade from a free WAF to a paid plan?

Businesses should consider upgrading when traffic increases significantly, when they need to create custom security rules for their system, or when they need additional protection layers, such as advanced DDoS mitigation and in depth bot protection, that the free plan cannot fully provide.

7. Does WAF Free VNETWORK have any limitations?

WAF Free VNETWORK is designed to meet the basic security needs of small and medium sized websites. As a business grows and needs advanced protection features such as multi layer DDoS defense or in depth bot protection, it can upgrade to higher tiers within VNETWORK's WAAP ecosystem without changing its existing infrastructure.