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.

Page 3 | Best Web Application Firewalls (WAF): User Reviews from September 2026

BitNinja

State-of-the-art server security with an all-in-one platform BitNinja offers an advanced server security solution with a proactive and unified system designed to effectively defend against a wide range of malicious attacks. Breaking new ground, BitNinja will be the first server security tool that protects Windows servers. Main solutions: - Reduce the server load as a result of the real-time IP reputation, with a database of 100M+ IP addresses thanks to BitNinja’s Defense Network - Stop zero-day exploits with the WAF module, and BitNinja’s self-written rules - Remove malware quickly and prevent reinfections with the industry-leader malware scanner - Enable the AI Malware Scanner to remove malware than ever before - Identify possible backdoors in your system with the Defense Robot - Protect your server from brute-force attacks with the Log Analysis module that runs silently in the background - Regularly examine and clean your database with the Database Cleaner - Discover and eliminate vulnerabilities in your website at no additional cost with the SiteProtection module - Block spam accounts, prevent server blocklisting, and gain insights into outgoing spam emails with the Outbound - Spam Detection module powered by ChatGPT - Trap suspicious connections with Honeypots and block access through backdoors with the Web Honeypot BitNinja Security stops the latest attack types, including: - All types of malware - with the best malware scanner in the market - Brute-force attacks at both network and HTTP levels; - Vulnerability exploitation – CMS (WP/Drupal/Joomla) - SQL injection - XSS - Remote code execution - Zero-day attacks; - DoS (denial of service) attacks BitNinja Security makes it easy to secure web servers: - 1-line code installation - Fully automated operation keeps servers safe and eliminates human error - AI-powered community-driven worldwide Defense Network - Unified, intuitive Dashboard for your whole infrastructure - Easy server management with Cloud Configuration - Premium support with a maximum 5-min response time - The convenience of a robust CLI - API available for automation and reporting - Seamless integrations with a wide range of platforms like Enhance control panel, 360 Monitoring, and JetBackup. BitNinja is supported on THE PLATFORM and up, installed on the following Linux distributions: CentOS 7 and up 64 bit CloudLinux 7 and up 64 bit Debian 8 and up 64 bit Ubuntu 16.04 and up 64 bit RedHat 7 and up 64 bit AlmaLinux 8 64 bit VzLinux 7 and up 64 bit Rocky Linux 8 64 bit Amazon Linux 2 64 bit Windows 2012 RE and newer

Average Rating: 4.6/5.0

Total Reviews: 20

How Do G2 Users Rate BitNinja?

Has the product been a good partner in doing business?: 8.9/10 (Category avg: 8.8/10)
Traffic Controls: 10.0/10 (Category avg: 9.2/10)
Security Monitoring: 10.0/10 (Category avg: 9.1/10)
Issue Tracking: 10.0/10 (Category avg: 8.7/10)

Who Is the Company Behind BitNinja?

Seller: BitNinja Ltd.
Year Founded: 2014
HQ Location: Debrecen
Twitter: @bitninjaio
1,079 Twitter followers
LinkedIn® Page: www.linkedin.com
24 employees on LinkedIn®

Who Uses This Product?

Top Industries: Information Technology and Services, Internet
Company Size: 88% Small, 8% Medium

What Are Recent G2 Reviews of BitNinja?

"Security suite at it best"

Rating: 4.0/5.0 stars

— Dhruval J.

Best Web Application Firewalls (WAF) - Page 3

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Category Stats (Sep 2026)

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G2 Grid® for Web Application Firewalls (WAF)

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