open-appsec

Preemptive

Prevents OWASP-Top-10 and zero-day threats against Web App & APIs by using ML-based security without signature updates (e.g. blocked Log4Shell and Spring4Shell with no updates)

Precise

Continuous learning delivers precise detection, finding more attacks while eliminating constant fine tuning and exception creation inherent in traditional WAFs.

Automatic

Cloud native CI/CD-friendly deployment and automation - from installation to upgrades, to configuration - using declarative infra-as-code or APIs.

Open Source WAF

Makes effective Web & API security based on a ML-based engine that is painless to configure and manage available for everyone to use and expand build upon (GitHub).

Principles

Thank you for your incredible support!

🎉 open-appsec surpassed 1000 GitHub Stars! 🌟

Use open-appsec also as Cloud Service using the Enterprise Edition. See here

automatic web application & API security using machine learning

Check out the results and testing methodology

The 2025 WAF Comparison Report is Now Live!

Features

API Discovery and Security

Know your API usage and narrow your attack surface to keep API activity within safe limits through ML-based malicious content blocking and OpenAPI schema validation.

Anti-Bot

Identify and stop automated attacks before intrusion, theft or harm to customer experiences.

Intrusion Prevention (IPS)

Protect against over 2,800 Web CVEs, based on award winning NSS-Certified IPS and a fully open Snort 3.0.

ML-Based Threat Prevention (WAF)

Prevents OWASP-10 and zero day threats automatically using ML engine and scoring based on transaction, user behavior, crowd behavior & content risk. No signatures.

File Security

Prevent malicious files from being uploaded to web apps and APIs. The engine scans uploaded files and consults a huge cloud repository as to the file's reputation.

Rate Limiting

Set a cap on how many requests can be made within a certain period to web apps and APIs, based on identifiers such as IP address or keys within JWT, cookies or headers.

Crowd Wisdom

Block requests from malicious IPs based on crowd wisdom gathered in real-time from 64,000+ contributing servers via partnership with CrowdSec.

Log4Shell

Immunity against a critical vulnerability in a highly popular library used in many production environments. Exploitation allows remote code execution, DDoS and other attacks.

Text4Shell

Immunity against a critical vulnerability in a library used in 2500 software projects. Exploitation allows remote code execution.

Spring4Shell

Immunity against a critical vulnerability in the widely used Java Spring Framework. Exploitation allows remote code execution.

WAF bypass

Immunity against a critical vulnerability that allows bypassing all WAFs by appending JSON syntax to SQL injection payloads.

Zero-Day Security

The only WAF that blocked these attacks preemptively without signatures

AppSec is an 'install and forget' solution. We don't need to mobilize valuable team members to monitor the solution. It provides state-of-the-art protection and allows us to focus on new business and customer satisfaction.

David Cancalon | CTO, Proxeem