NSFOCUS Web Application Firewall

What it does

NSFOCUS Web Application Firewall is a Web Application and API Protection (WAAP) offering that consolidates OWASP Top 10 defense, bot management, API protection, and application-layer DDoS mitigation behind a single policy engine. Its distinguishing mechanism is a multi-layered detection pipeline that pairs semantic analysis with behavioral modeling and smart patching, pre-filtering traffic and applying customizable detection criteria so both known signatures and emerging attack patterns are caught before they reach the application.

How it works

The platform inspects inbound requests through traffic pre-filtering and semantic analysis, then models user behavior to separate legitimate sessions from malicious automation. Bot defenses issue dynamic tokens and apply obfuscation to block replay and scraping, while API protection uses active and passive discovery to inventory assets, surface shadow APIs, oversee parameters, and flag sensitive-data exposure. Virtual patching mitigates newly disclosed vulnerabilities without code changes. For AI-facing applications, an inline or mirror gateway performs input verification, inference monitoring, and output compliance to counter prompt injection and data leakage. It runs as hardware or virtual appliances and across major public clouds.

Credentials and traction

The NSFOCUS WAF family holds ICSA Labs Web Application Firewall Certification (2021), and NSFOCUS maintains ISO 27001 and ISO 27701:2019 certification covering its information-security and privacy management systems. NSFOCUS was named a Representative Vendor in the 2025 Gartner Market Guide for Cloud Web Application and API Protection. The company serves more than 200,000 customers, including four of the ten largest global telecommunications carriers and major financial institutions.