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Web Application Firewall (WAF) reviews by real, verified users. Find unbiased ratings on user satisfaction, features, and price based on the most reviews available anywhere.

Best Web Application Firewall (WAF) Software

Web application firewalls (WAF) are designed to protect web apps by filtering and monitoring incoming traffic. These tools analyze HTTP traffic as it comes in, blocking potentially malicious traffic and identifying traffic anomalies. Companies use these tools in conjunction with additional application security software to better protect operational web applications. These tools differ from traditional firewalls, which control traffic between servers, by filtering traffic and content attempting to access a specific web-based application.

To qualify for inclusion in the Web Application Firewalls (WAF) category, a product must:

Inspect traffic flow at the application level
Filter HTTP traffic for web-based applications
Block attacks such as SQL injections and cross-site scripting

Top 7 Web Application Firewall (WAF) Software

  • Nginx
  • Imperva Cloud Application Security
  • Cloudflare WAF
  • ModSecurity
  • Sucuri
  • Cloudbric

Compare Web Application Firewall (WAF) Software

G2 takes pride in showing unbiased reviews on user satisfaction in our ratings and reports. We do not allow paid placements in any of our ratings, rankings, or reports. Learn about our scoring methodologies.
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(83)4.6 out of 5
Entry Level Price:Starting at $2500 per year

NGINX, Inc. is the company behind NGINX, the popular open source project trusted by more than 400 million sites. We offer a suite of technologies for developing and delivering modern applications. The NGINX Application Platform enables enterprises undergoing digital transformation to modernize legacy, monolithic applications as well as deliver new, microservices‑based applications. Companies like Netflix, Starbucks, and McDonalds rely on NGINX to reduce costs, improve resiliency, and speed innov

(78)4.1 out of 5
Optimized for quick response
Entry Level Price:Free

Imperva Incapsula delivers an enterprise-grade Web Application Firewall to safeguard your site from the latest threats, an intelligent and instantly effective 360-degree anti-DDoS solutions (layers 3-4 and 7), a global CDN to speed up your website's load speed and minimize bandwidth usage and an array of performance monitoring and analytic services to provide insights about your website's security and performance.

(34)4.1 out of 5

AWS WAF is a web application firewall that helps protect web applications from common web exploits that could affect application availability, compromise security, or consume excessive resources.

(17)4.5 out of 5

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.

(14)4.2 out of 5

ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.

(34)3.4 out of 5

Sucuri is a managed security service provider for websites. Our cloud-based tools provide complete website security solution, including performance optimization via a CDN, mitigation of external attacks like vulnerability exploits and DDoS attacks, and professional response in the event of security incident. The team provides 24/7/365 customer service with a 97% satisfaction rate, and a median response time of 4 hours.

(12)4.2 out of 5
Entry Level Price:$0

Cloudbric is a cloud-based web security provider, offering an award-winning Web Application Firewall (WAF), DDoS protection, and SSL. Cloudbric offers security primarily to SMB websites that lack cybersecurity experience or can't afford expensive IT security solutions. Please visit to learn about our flexible business models.

(9)4.4 out of 5

Extend the power of Cloudflare's DDoS, TLS, and IP Firewall to not just your web servers, but also your other TCP-based services, keeping them online and secure.

Expedited, complete cleanup, plus ongoing protection to stop malware from coming back.

Eliminate application vulnerabilities and stop data breaches. You depend on applications everyday. They are how your customers and partners connect with you, and they are how your employees get their jobs done. Unfortunately, your applications remain one of the most commonly exploited threat vectors. Barracuda WAF protects your web, mobile and API applications from being compromised, and prevents data breaches— ensuring you maintain your reputation and your customer's confidence.

(8)4.3 out of 5

Citrix Web App Firewall is a web application firewall (WAF) that protects web applications and sites from both known and unknown attacks, including application-layer and zero-day threats.

(11)4.9 out of 5

Reblaze is a cloud-based, fully managed website, Web Apps and API security solution. We offer an all-in-one virtual private cloud security solution (VPC) that includes next-gen WAF, DoS/DDoS protection, API security, Bot mitigation, CDN, load balancing, real-time traffic analysis, and more. The platform offers a unique combination of benefits from Machine learning, which provides accurate and adaptive threat detection to our dedicated VPC that guarantees not only maximum privacy, but also levera

We protect against the full spectrum of threats your web applications and APIs actually face.

WAF is a cloud firewall service that protects core website data and safeguards the security and availability of your site

(3)4.7 out of 5

FortiWeb WAF is a comprehensive, high-performance web application security service.

(3)4.7 out of 5

Templarbit Shield secures the software that runs your business. It stops malicious traffic, helps you keep sensitive data from getting exposed and will discover anomalies that could be early indicators of a breach.

(2)4.0 out of 5

AppSecure is a suite of application security capabilities for Juniper Networks SRX Series Services Gateways that identifies applications for greater visibility, enforcement, control, and protection of the network.

Comodo cWatch Web is a managed security service for websites and applications that combines a Web Application Firewall (WAF) provisioned over a secure Content Delivery Network (CDN).

(2)4.5 out of 5

Fastlymassive globally distributed network provides rapid protection against web application vulnerabilities, DDoS, and botnet attacks. Enforce security rules at the edge with real-time insights into suspicious traffic and the ability to update your configuration in milliseconds.

(3)3.7 out of 5

Secure and accelerate your websites, apps, APIs, media streams, and more with edge services on a platform built for cloud scale.

Web Application Protector is designed to safeguard web assets from web application and DDoS attacks, while improving performance.

(1)5.0 out of 5

AppWall is a web application firewall (WAF) and network security solution that guarantees fast, reliable and secure web applications.

(1)5.0 out of 5

Built on a proven security platform. Enterprise-proven technology that provides comprehensive protection from all OWASP recognized security risks, DDoS attacks, and even the most advanced zero-day threats. Proactive bot defense ensures always-on protection from automated attacks, web scraping, and brute force attacks. Simplified application security for everyone. Remove the complexity of setting up and configuring your application security solution. Barracuda WAF-as-a-Service delivers protectio

A comprehensive web application firewall (WAF) that protects apps and data from known and unknown threats, defends against bots that bypass standard protections, and virtually patches app vulnerabilities.

Web application attacks deny services and steal sensitive data. Imperva Web Application Firewall (WAF) analyzes and inspects requests coming in to applications and stops these attacks.

(1)4.0 out of 5

Indusface web application scanning helps detect web application vulnerabilities, malware, and logical flaws with daily or on-demand comprehensive scanning. Managed by certified security experts, Indusface web application scanning helps organizations find a greater business impact of logical flaws with detailed demonstrations through proof-of-concept.

(1)1.0 out of 5

Qualys WAF is an integrated web application firewall (WAF) and web application scanning (WAS) solution.

Web Application Firewall is a web based app that protect website from the malicious attacks, including OWASP Top 10 protection around code injection, HTML injection, directory traversal, command injection, JSON validation, SQL injection and cross-site scripting. In addition, signature-based engines can be used for blocking known attack patterns.

0 ratings

Wallarm is an AI-powered application security solution for the teams launching new modular software services or upgrading their existing web applications to a new stack. Wallarm includes an adaptive Next Gen WAF, attack sandboxing, vulnerability scanner and development time testing modules.

0 ratings

Airlock Suite is Ergon's all-round IT security product.

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Check out the G2 Grid® for the top Web Application Firewall (WAF) Software products. G2 scores products and sellers based on reviews gathered from our user community, as well as data aggregated from online sources and social networks. Together, these scores are mapped on our proprietary G2 Grid®, which you can use to compare products, streamline the buying process, and quickly identify the best products based on the experiences of your peers.
High Performers
Imperva Cloud Application Security
Cloudflare WAF
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Learn More About Web Application Firewall (WAF) Software

What is Web Application Firewall (WAF) Software?

WAF software products are used to protect web applications and websites from threats or attacks. The firewall monitors traffic between users, applications, and other internet sources. They're effective in defending against cross-site forgery, cross-site scripting (XSS attacks), SQL injection, DDoS attacks, and many other kinds of attacks.

These software solutions provide automatic defense and allow administrative control over rule sets and customization since some applications may have unique traffic trends, zero-day threats, or web application vulnerabilities. These tools also provide logging features to document and analyze attacks, incidents, and normal application behaviors.

Companies with web applications should use WAF tools to ensure all weak spots in the application itself are filled. Without WAF, many threats may go undetected, and data leakage may occur. They have truly become an obligatory component of any business-critical web application containing sensitive information.

Key Benefits of Web Application Firewall (WAF) Software

  • Protection against web-based threats
  • Historical documentation of incidents and events
  • Elastic, scalable web application protection

Why Use Web Application Firewall (WAF) Software?

There are a variety of benefits associated with WAF tools and ways they can boost security of applications deployed online. Most of the reasoning behind WAF usage is the generally accepted belief that web-based threats should be a concern for all businesses. Therefore, all businesses deploying web-based applications should be sure they are doing all they can to defend against the myriad cyberthreats that exist today.

Some of the numerous threats WAF products can help defend against include:

  • Cross-Site Scripting (XSS) — Cross-site scripting (XSS) is an attack where a malicious script is injected into websites using a web application to send malicious code. Malicious scripts can be used to access information such as cookies, session tokens, and other sensitive data collected by web browsers.
  • Injection Flaws — Injection flaws are vulnerabilities which allow attackers to send code through an application to another system. The most common type is a SQL injection. In this scenario, an attacker finds a point in which the web application passes through a database, executes their code, and can begin querying whatever information they want.
  • Malicious File Execution — Malicious file execution is accomplished when an attacker is able to input malicious files that are uploaded to the web server or application server. These files can be executed upon upload and completely compromise an application server.
  • Insecure Direct Object Reference — Insecure direct object reference occurs when user input can directly access an application's internal components. These vulnerabilities can allow attackers to bypass security protocols and access resources, files, and data directly.
  • Cross-Site Request Forgery (CSRF) — CSRF attacks force users to execute actions on a web application the user has permission to access. These actions can force users to unwillingly submit requests that may damage the web application or change their credentials to something the attacker can reuse to gain access to an application at a future date.
  • Information Leakage — Information leakage can occur when unauthorized parties are able to access databases or visit URLs that are not linked from the site. Attackers may be capable of accessing sensitive files such as password backups or unpublished documents.
  • Improper Error Handling — Error handling refers to preprogrammed measures that allow applications to dismiss unexpected events without exposing sensitive information. Improper error handling leads to a number of various issues, including the release of data, vulnerability exposure, and application failure.
  • Broken Authentication — Broken authentication is the result of improper credential management functions. If authentication measures fail to function, attackers can walk by security measures without the valid identification. This can lead to attackers gaining direct access to entire networks, servers, and applications.
  • Session Management — Session management errors occur when attackers manipulate or capture the tokenized ID provided to authenticated visitors. Attackers can impersonate generic users or target privileged users to gain access control and hijack an application.
  • Insecure Cryptographic Storage — Cryptographic storage is used to authenticate and protect communications online. Attackers may identify and obtain unencrypted or poorly encrypted resources that may contain sensitive information. Proper encryption typically protects against this, but poor key storage, weak algorithms, and flawed key generation may put sensitive data at risk.
  • Insecure Communications — Insecure communications occur when messages exchanged between clients and servers becomes visible. Poor network firewalls and network security policies can lead to easy access for attackers by gaining access to a local network or carrier device or installing malware on a device. Once applications are exploited, individual user information and other sensitive data becomes extremely vulnerable.
  • Failure to Restrict URL Access — Applications may fail to restrict URL access to unauthorized parties who attempt to visit unlinked URLs or files without permission. Attackers may bypass security by directly accessing URLs containing sensitive information or data files. URL restriction can be accomplished by utilizing page tokens or encrypting URLs to restrict access unless they visit restricted pages through approved navigational paths.

Who Uses Web Application Firewall (WAF) Software?

The actual individuals using application firewalls are software developers and security professionals. The developer will typically build and implement the firewall, while it is maintained and monitored by security operations teams. Still, there are a few industries that may be more inclined to use WAF tools for various purposes.

Internet Businesses — Internet businesses are a natural fit for WAF tools. They often have one or multiple public-facing web applications and various internal web apps for employee use. Both of these kinds of applications should be guarded by some kind of firewall, as well as additional layers of security. While nearly all modern businesses use web applications in some capacity, internet-centric businesses are more susceptible to attacks simply because they likely possess more web apps.

E-Commerce Professionals — E-commerce professionals and e-commerce businesses that build their own online tools should be using WAF technology. Many e-commerce applications are managed by some kind of SaaS provider, but custom-built tools are incredibly vulnerable without an application firewall. E-commerce businesses who fail to protect their applications put the data of their visitors, customers, and business on the line.

Compliant-Required Industries — Industries that require a higher level of compliance for data security should use a web application firewall for any application that communicates with a server or network with access to sensitive information. The most common business types with increased compliance requirements include health care, insurance, and energy industries. But many countries and localities have expanded IT compliance requirements across industries to prevent data breaches and the release of sensitive information.

Web Application Firewall (WAF) Software Features

Some WAF products may be geared toward specific applications, but most share a similar set of core security features and capabilities. The following are a handful of common features to look for when considering the adoption of WAF tools.

Logging and Reporting — Provides required reports to manage the business. Provides adequate logging to troubleshoot and support auditing.

Issue Tracking — Tracks security issues as they arise and manages various aspects of the mitigation process.

Security Monitoring — Detects anomalies in functionality, user accessibility, traffic flows, and tampering.

Reporting and Analytics — Provides documentation and analytical capabilities for data gathered by the WAF product.

Application-Layer Control — Gives user-configurable WAF rules, such as application control requests, management protocols, and authentication policies, to increase security.

Traffic Control — Limits access to suspicious visitors and monitors for traffic spikes to prevent overloads like DDoS attacks.

Network Control — Lets users provision networks, deliver content, balance loads, and manage traffic.