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Q: What is a web application firewall (WAF)?

A web application firewall sits between the internet and your web application, inspecting HTTP and HTTPS traffic at the application layer to block attacks targeting your application logic, database, and APIs. Unlike a network firewall that controls access based on IP addresses and ports, a WAF understands web application protocols and can block attacks like SQL injection through otherwise-allowed traffic.

Q: What is the OWASP Top 10?

The OWASP Top 10 is a regularly updated list of the ten most critical web application security risks, including injection attacks, broken access control, cryptographic failures, and security misconfiguration. A WAF provides defense-in-depth against these categories without requiring code changes to the application itself.

Web Application Firewalls. Protect your public-facing apps from OWASP threats, bots, and DDoS.

Firewalls.com carries web application firewall (WAF) solutions from Barracuda, Fortinet, and SonicWall that protect websites, APIs, and web applications from SQL injection, cross-site scripting, OWASP Top 10 exploits, automated bot attacks, and volumetric DDoS. Whether you run an e-commerce site, a patient portal, or a customer-facing API, our certified engineers help you deploy and tune a WAF that blocks attacks without breaking legitimate traffic.

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Web Application Firewalls at a Glance

Top Brands

Barracuda, Fortinet FortiWeb, SonicWall

Deployment

Inline appliance, reverse proxy, and cloud

Coverage

OWASP Top 10, bot mitigation, DDoS

API Protection

REST and GraphQL API security included

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Web Application Firewalls at a Glance

OWASP Top 10 Protection

The OWASP Top 10 represents the most critical web application security risks, including SQL injection, cross-site scripting (XSS), broken authentication, insecure deserialization, and security misconfigurations. A WAF inspects HTTP and HTTPS traffic at the application layer and blocks requests that match attack patterns before they reach the web server or database. Rule sets are updated continuously as new attack variants emerge, without requiring application code changes.

Bot Management

Automated bots account for a significant share of web traffic, ranging from legitimate search engine crawlers to malicious scrapers, credential stuffers, and vulnerability scanners. WAF bot management distinguishes between good and bad bots using behavioral analysis, fingerprinting, and challenge-response mechanisms such as CAPTCHA and JavaScript challenges. This protects login pages from brute-force and credential-stuffing attacks and prevents competitors from scraping pricing or product data.

DDoS Mitigation

Volumetric DDoS attacks attempt to overwhelm a web server by flooding it with traffic from many sources simultaneously. WAF DDoS protection applies rate limiting, connection limits, and traffic shaping at the application layer to absorb or redirect attack traffic before it reaches the origin server. Barracuda WAF and FortiWeb include built-in DDoS mitigation that activates automatically when attack patterns are detected.

SSL Inspection and API Security

Because most web traffic is encrypted over HTTPS, a WAF must decrypt and inspect traffic to block application-layer attacks. SSL offloading at the WAF reduces the computational load on backend web servers while enabling deep inspection of encrypted payloads. API-aware WAFs extend protection to REST and GraphQL endpoints, enforcing schema validation, rate limiting, and access control on API traffic that traditional network firewalls cannot inspect.

Running a public-facing website or API without a WAF?

PCI DSS requires a WAF for any system that handles cardholder data. HIPAA and many state privacy laws increasingly expect equivalent controls for patient and consumer data. Our engineers can assess your web application exposure and recommend the right WAF deployment model for your environment.

Talk to a WAF Expert

Web Application Firewalls FAQ

What is a web application firewall (WAF)?

A web application firewall is a security appliance or service that sits between the internet and your web application, inspecting HTTP and HTTPS traffic at the application layer to block attacks targeting your application logic, database, and APIs. Unlike a network firewall that controls access based on IP addresses and ports, a WAF understands web application protocols and can distinguish between a legitimate user submitting a form and an attacker injecting SQL commands into the same form field.

What is the difference between a WAF and a network firewall?

A network firewall controls which ports and protocols can communicate between network segments, blocking unauthorized connections at the network layer. A WAF operates at the application layer (Layer 7) and inspects the actual content of web requests, blocking attacks that come through allowed ports over allowed protocols. Both are necessary: the network firewall limits network access and the WAF protects the web application itself from exploitation through legitimate HTTP and HTTPS connections that the network firewall cannot distinguish from normal traffic.

What is the OWASP Top 10?

The OWASP Top 10 is a regularly updated list published by the Open Web Application Security Project identifying the ten most critical web application security risks. The current list includes injection attacks (SQL, OS command, LDAP), broken access control, cryptographic failures, insecure design, security misconfiguration, vulnerable and outdated components, identification and authentication failures, software and data integrity failures, security logging failures, and server-side request forgery. A WAF provides defense-in-depth against these categories without requiring code changes to the application itself.

Do I need a WAF if I already use a CDN?

A CDN improves performance and provides some basic DDoS absorption through traffic distribution, but it is not a substitute for a dedicated WAF. CDN-based WAF offerings vary significantly in their rule quality, tuning options, and API protection capabilities. Organizations subject to PCI DSS, HIPAA, or SOC 2 typically require a dedicated WAF with auditable rule sets, logging, and compliance reporting, which CDN-bundled security features do not always provide. A dedicated WAF appliance or service gives you granular control over application security policies.

Is a WAF required for PCI DSS compliance?

Yes. PCI DSS Requirement 6.4 requires that all public-facing web applications are protected against known attacks either by installing a WAF in front of the application or by performing a web application security assessment and remediating all identified vulnerabilities. In practice, a WAF is the preferred option because it provides continuous protection as new vulnerabilities emerge, whereas a point-in-time assessment requires repeated retesting. Barracuda WAF and Fortinet FortiWeb both include PCI DSS compliance reporting features.

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Our certified engineers will assess your web application exposure, recommend the right WAF deployment model, and configure it to block attacks without disrupting legitimate traffic.

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Fortinet FortiADC-VM04 IP Reputation Service - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM04-140-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$1,887.60
22% OFF! $2,420.00

Product Details →
Fortinet FortiADC-VM04 Fortinet FortiADC WAF Security Service - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM04-144-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$1,887.60
22% OFF! $2,420.00

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Barracuda Virtual Web Application Firewall 960Vx - 1 Month License

OWASP Top 10 Protection for SQL Injection, Cross-Site Scripting, & Cookie/Form Tampering

Adaptive security with website cloaking & URl encryption

Customizable role-based administration with interactive & scheduled reports

Manufacturer Part #: BWFV960a-v
For Pricing, request a quote.

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FortiADC-300D 1 Year FortiCare Premium Support

FortiCare Premium covers you around the clock, for whenever you need technical support coverage. It includes web, chat, and telephone support to our global team.

Hardware replacements are sent next business day shipping, ahead of you returning the original device.

Foundational FortiGuard subscriptions for dynamic policies are included.
Service Length: 1 Year License
Manufacturer Part #: FC-10-A0301-247-02-12

NOTICE: Fortinet License & Renewal products may only be activated in the United States of America.
$2,022.99
12% OFF! $2,298.85

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Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 3 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM01-248-02-36

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$2,032.80
12% OFF! $2,310.00

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Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM04-248-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$2,129.60
12% OFF! $2,420.00

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Barracuda Web Security Gateway Appliance 210

Throughput: 5-10 Mbps

Concurrent Users: 25-100

Form Factor: Desktop

Ethernet Bridge: N/A

Manufacturer Part #: BYF210a
For Pricing, request a quote.

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All orders placed after 3pm EST will ship on the next business day
Fortinet FortiADC-VM01 Virtual Appliance

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FAD-VM01

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,003.00
22% OFF! $3,850.00

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Barracuda Web Security Gateway Appliance 310

Throughput: 100-150 Mbps

Concurrent Users: 100-400

Form Factor: 1U Mini

Ethernet Bridge: 1 x Gigabit

Manufacturer Part #: BYF310a
For Pricing, request a quote.

Product Details →

All orders placed after 3pm EST will ship on the next business day
Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 5 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM01-248-02-60

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,388.00
12% OFF! $3,850.00

Product Details →
Fortinet FortiADC-VM08 IP Reputation Service - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM08-140-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,432.00
22% OFF! $4,400.00

Product Details →
Fortinet FortiADC-VM08 Fortinet FortiADC WAF Security Service - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM08-144-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,432.00
22% OFF! $4,400.00

Product Details →
Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 3 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM02-248-02-36

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,484.80
12% OFF! $3,960.00

Product Details →
Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 1 x vCPU core

Explore Management & Configuration Options for this device

Throughput: 25 Mbps

vCPU Support (Minimum / Maximum): 1

Storage Support (Minimum / Maximum): 40 GB / 2 TB

Enhanced protection with Fortinet Security Fabric integration

Visual analytics tools for advanced threat insights

Manufacturer Part #: FWB-VM01
$3,621.54
22% OFF! $4,643.00

Product Details →
Fortinet FortiADC-VM08 24x7 Comprehensive FortiCare - 1 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM08-248-02-12

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$3,872.00
12% OFF! $4,400.00

Product Details →
FortiADC-1000F 1 Year IP Reputation Service

Uses threat sensors, CERTs, MITRE, cooperative competitors, and other global sources

Near real-time intelligence from distributed network gateways

Service Length: 1 Year License
Manufacturer Part #: FC-10-AD1KF-140-02-12

NOTICE: Fortinet License & Renewal products may only be activated in the United States of America.
$4,680.00
22% OFF! $6,000.00

Product Details →
Fortinet FortiADC-VM02 Virtual Appliance

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FAD-VM02

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$5,148.00
22% OFF! $6,600.00

Product Details →
FortiADC-1000F 1 Year FortiCare Premium Support

FortiCare Premium covers you around the clock, for whenever you need technical support coverage. It includes web, chat, and telephone support to our global team.

Hardware replacements are sent next business day shipping, ahead of you returning the original device.

Foundational FortiGuard subscriptions for dynamic policies are included.
Service Length: 1 Year License
Manufacturer Part #: FC-10-AD1KF-247-02-12

NOTICE: Fortinet License & Renewal products may only be activated in the United States of America.
$5,280.00
12% OFF! $6,000.00

Product Details →
Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 5 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM02-248-02-60

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$5,808.00
12% OFF! $6,600.00

Product Details →
Barracuda Web Security Gateway Appliance 410

Throughput: 150-250 Mbps

Concurrent Users: 300-800

Form Factor: 1U Mini

Ethernet Bridge: 1 x Gigabit

Manufacturer Part #: BYF410a
For Pricing, request a quote.

Product Details →

All orders placed after 3pm EST will ship on the next business day
Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 3 Year

Comprehensive server load balancing for 99.999% application uptime

Server offloading for improved application acceleration, scale, & TCO

Intelligent traffic management for optimized application delivery and availability

Hardware-based SSL Offloading, Forward Proxy, and Visibility

Authentication Offloading

Included Global Servers Load Balancing & Link Load Balancing

Manufacturer Part #: FC-10-AVM04-248-02-36

NOTICE: Fortinet License & Renewal products can only be activated in the United States of America.
$6,388.80
12% OFF! $7,260.00

Product Details →
Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 2 x vCPU core

Explore Management & Configuration Options for this device

Throughput: 100 Mbps

vCPU Support (Minimum / Maximum): 2

Storage Support (Minimum / Maximum): 40 GB / 2 TB

Enhanced protection with Fortinet Security Fabric integration

Visual analytics tools for advanced threat insights

Manufacturer Part #: FWB-VM02
$7,247.76
22% OFF! $9,292.00

Product Details →

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Shop Web Application Firewalls

Web Application Firewalls. Protect your public-facing apps from OWASP threats, bots, and DDoS.

Web Application Firewalls at a Glance

OWASP Top 10 Protection

Bot Management

DDoS Mitigation

SSL Inspection and API Security

Running a public-facing website or API without a WAF?

Web Application Firewalls FAQ

Ready to protect your web applications from the inside out?

You'll always get our best prices when you're signed in!

Fortinet FortiADC-VM04 IP Reputation Service - 1 Year

Fortinet FortiADC-VM04 Fortinet FortiADC WAF Security Service - 1 Year

Barracuda Virtual Web Application Firewall 960Vx - 1 Month License

FortiADC-300D 1 Year FortiCare Premium Support

Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 3 Year

Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 1 Year

Barracuda Web Security Gateway Appliance 210

Fortinet FortiADC-VM01 Virtual Appliance

Barracuda Web Security Gateway Appliance 310

Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 5 Year

Fortinet FortiADC-VM08 IP Reputation Service - 1 Year

Fortinet FortiADC-VM08 Fortinet FortiADC WAF Security Service - 1 Year

Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 3 Year

Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 1 x vCPU core

Fortinet FortiADC-VM08 24x7 Comprehensive FortiCare - 1 Year

FortiADC-1000F 1 Year IP Reputation Service

Fortinet FortiADC-VM02 Virtual Appliance

FortiADC-1000F 1 Year FortiCare Premium Support

Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 5 Year

Barracuda Web Security Gateway Appliance 410

Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 3 Year

Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 2 x vCPU core

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Shop Web Application Firewalls

Web Application Firewalls. Protect your public-facing apps from OWASP threats, bots, and DDoS.

Web Application Firewalls at a Glance

OWASP Top 10 Protection

Bot Management

DDoS Mitigation

SSL Inspection and API Security

Running a public-facing website or API without a WAF?

Web Application Firewalls FAQ

Ready to protect your web applications from the inside out?

You'll always get our best prices when you're signed in!

Fortinet FortiADC-VM04 IP Reputation Service - 1 Year

Fortinet FortiADC-VM04 Fortinet FortiADC WAF Security Service - 1 Year

Barracuda Virtual Web Application Firewall 960Vx - 1 Month License

FortiADC-300D 1 Year FortiCare Premium Support

Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 3 Year

Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 1 Year

Barracuda Web Security Gateway Appliance 210

Fortinet FortiADC-VM01 Virtual Appliance

Barracuda Web Security Gateway Appliance 310

Fortinet FortiADC-VM01 24x7 Comprehensive FortiCare - 5 Year

Fortinet FortiADC-VM08 IP Reputation Service - 1 Year

Fortinet FortiADC-VM08 Fortinet FortiADC WAF Security Service - 1 Year

Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 3 Year

Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 1 x vCPU core

Fortinet FortiADC-VM08 24x7 Comprehensive FortiCare - 1 Year

FortiADC-1000F 1 Year IP Reputation Service

Fortinet FortiADC-VM02 Virtual Appliance

FortiADC-1000F 1 Year FortiCare Premium Support

Fortinet FortiADC-VM02 24x7 Comprehensive FortiCare - 5 Year

Barracuda Web Security Gateway Appliance 410

Fortinet FortiADC-VM04 24x7 Comprehensive FortiCare - 3 Year

Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 2 x vCPU core

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