Open-source alternatives to Nuclei

afrog is an HTTP vulnerability scanner and web vulnerability management system that identifies security flaws and known CVEs using a YAML-based rule engine. It functions as a payload generator and scanner, comparing server responses against detection rules to find unauthorized access points. The project provides a framework for out-of-band security testing, detecting blind vulnerabilities by triggering and verifying external DNS or HTTP callbacks. Beyond web traffic, it includes a protocol fuzzer capable of executing multi-step read and write sequences over raw TCP and SSL sockets to identify

Sn1per is a vulnerability management platform and penetration testing orchestrator designed to automate reconnaissance, vulnerability scanning, and exploit verification. It functions as a dockerized security toolkit that coordinates multiple tools into a unified automated pipeline to identify security flaws across network and web assets. The platform features an attack surface manager for discovering internet-facing assets through OSINT, DNS enumeration, and certificate transparency. It distinguishes itself with an AI-powered security analyzer that uses large language models to summarize scan

Nuclei-templates is a security automation framework and vulnerability scanning library designed for the continuous assessment of distributed infrastructure. It functions as a collection of structured configuration files that define how to identify security flaws and misconfigurations across web applications and network services. The project utilizes a declarative domain-specific language to decouple detection logic from the underlying execution engine. This approach allows for the creation of modular, protocol-agnostic scanning rules that can be updated independently of the core software. By

Nikto is an open-source HTTP security auditing tool and web server vulnerability scanner. It functions as a reconnaissance engine designed to identify insecure server options, outdated software, and common vulnerabilities by analyzing HTTP responses. The project differentiates itself through capabilities for intrusion detection evasion and web server fingerprinting. It uses request-level encoding and timing spacers to bypass security filters and employs signature-based identification to determine specific server software versions and misconfigurations. The scanner covers broad capability are

Fscan is an automated penetration testing tool designed for internal network reconnaissance and vulnerability assessment. It functions as a comprehensive security framework that maps network infrastructure, identifies active hosts and services, and detects security weaknesses across internal environments. The tool distinguishes itself through a modular plugin architecture that allows for extensible security checks and a stateful asset tracking system that maintains an in-memory registry of discovered infrastructure. It incorporates a dedicated credential brute-force engine for testing passwor

ScopeSentry is a distributed attack surface management platform designed to catalog digital assets and automate security assessments across large network environments. It functions as a network asset discovery tool and vulnerability scanner, providing a framework for maintaining visibility over organizational infrastructure. The platform distinguishes itself through a distributed architecture that orchestrates worker nodes to execute security tasks in parallel. It utilizes an event-driven discovery process to identify new assets and subdomains, maintaining a stateful record of configurations

Vuls is an agentless vulnerability scanner and CVE intelligence aggregator. It identifies security flaws in operating systems, containers, and network devices without requiring the installation of permanent software agents on target machines. The project distinguishes itself by cross-referencing software versions against multiple vulnerability databases, security advisories, and known exploit catalogs. It utilizes platform-based enumeration and lockfile analysis to detect vulnerabilities in network hardware, programming libraries, and website plugins. The tool covers a broad range of securit

Strix is an automated security research and vulnerability scanning platform that leverages language models to orchestrate complex security analysis tasks. It functions as a comprehensive framework for penetration testing and continuous security integration, allowing users to embed automated vulnerability research directly into development pipelines or execute it within isolated, containerized environments. The platform distinguishes itself through a multi-agent orchestration engine that coordinates specialized autonomous agents to perform parallel security assessments. By integrating LLM-agno

Trufflehog is a security tool designed to continuously monitor code repositories and cloud environments to detect, verify, and remediate exposed sensitive credentials and API keys. It functions as a comprehensive secret scanning engine that integrates directly into deployment pipelines and version control systems to intercept sensitive data before it is committed or pushed. By utilizing read-only operations and volatile memory processing, the system ensures that discovered credentials are never stored persistently, maintaining strict data privacy throughout the scanning lifecycle. The platfor

Wazuh is an integrated security platform that combines endpoint detection and response, security information and event management, and cloud workload protection. It functions as a centralized system for collecting telemetry, aggregating logs, and correlating events across distributed infrastructure to maintain security and integrity. The platform distinguishes itself through its active response orchestration, which allows for the automated execution of scripts on remote endpoints to neutralize threats in real time. It provides deep visibility into system activity through file integrity monito

This project is a comprehensive, curated directory of cybersecurity resources, software, and documentation designed to support system and network protection. It serves as a centralized knowledge base and index for security professionals, aggregating industry-standard practices and open-source tools across a wide range of technical domains. The repository distinguishes itself by providing a structured collection of methodologies and frameworks for security operations. It covers critical areas including threat intelligence, digital forensics, infrastructure auditing, and vulnerability assessmen

This project is an open-source intelligence reconnaissance framework and recursive attack surface mapper. It functions as a containerized security scanner designed to map public-facing infrastructure, perform subdomain enumeration, and automate the gathering of open-source intelligence. The system employs a recursive discovery engine to iteratively explore target infrastructure, utilizing a plugin-based module architecture to extend scanning capabilities. It integrates third-party APIs for data enrichment and applies YARA rules across discovered assets to identify specific vulnerability patte

theHarvester is a command-line utility designed for gathering open-source intelligence and mapping an organization's external attack surface. It functions as a security information gathering framework that automates the collection of publicly available data to assist in reconnaissance and threat analysis. The tool utilizes a plugin-based architecture to execute isolated queries against various search engines and public databases. It employs asynchronous task execution to run multiple discovery operations in parallel, while a centralized pipeline aggregates and deduplicates findings from these

Amass is an attack surface management tool designed to identify, map, and inventory an organization's internet-facing digital assets. It functions as a security asset discovery engine that systematically expands an organization's known infrastructure footprint through recursive domain name resolution and the collection of intelligence from diverse public data sources. The platform distinguishes itself by utilizing a graph-based modeling approach to organize discovered resources. By maintaining a persistent graph database, it tracks the relationships between infrastructure components and norma

Tsunami Security Scanner is a network vulnerability scanner and security auditor designed to identify high-severity flaws across network assets. It functions as an asynchronous security probe engine that utilizes automated probes and specialized detection logic to find critical weaknesses and prioritize remediation efforts. The project is distinguished by a plugin-based scanning engine, which uses a modular architecture of interchangeable detection plugins to identify vulnerabilities. This extensibility allows for the development and integration of custom security plugins to expand the variet

Faraday is a vulnerability management platform and security tool aggregator designed to centralize security findings from multiple scanners into a single dashboard. It utilizes a relational security database to catalog hosts, services, and security flaws, enabling users to track remediation and analyze organizational risk. The platform distinguishes itself through a plugin-based system that normalizes diverse security tool outputs into a unified data model. It supports deep integration with a wide array of scanners and CLI tools, intercepting shell command output or parsing report files to ag

SpiderFoot is an open-source reconnaissance and intelligence automation framework designed to streamline the collection and correlation of data for security investigations. It functions as a comprehensive platform that automates the querying of hundreds of public data sources to map digital footprints, identify exposed assets, and uncover potential security threats across an organization's external perimeter. The platform distinguishes itself through a modular, plugin-based architecture that executes data gathering tasks in parallel, supported by a directed graph data model that tracks relati

Amass is a network attack surface mapper and reconnaissance framework designed to discover and map the external, internet-facing infrastructure of a target organization. It functions as an open source intelligence tool that identifies public network boundaries and locates hidden or forgotten subdomains to define an organization's total reachable footprint. The project utilizes passive-source data aggregation from external APIs and public databases alongside active DNS brute-forcing and recursive subdomain expansion. It employs a graph-based asset mapping system to visualize the relationships

Katana is a web crawler and spider designed for security reconnaissance and web application mapping. It functions as a utility for identifying endpoints, forms, and API structures across web targets by combining standard HTTP request traversal with headless browser automation to render dynamic, JavaScript-heavy content. The tool distinguishes itself through its ability to maintain authenticated sessions and handle complex web interactions, such as automated form submission and captcha resolution. It provides granular control over the discovery process, allowing users to define specific crawl

This project is a network reconnaissance framework and internet metadata database used for collecting, storing, and analyzing data from active scanners and passive traffic captures. It functions as a threat intelligence aggregator and passive traffic analysis tool, merging scan results from multiple tools into a unified dataset for security investigation. The system distinguishes itself through its ability to visualize network assets using heatmaps and geographic charts to correlate autonomous systems and domain names. It provides external attack surface management by aggregating metadata to

Arachni is a dynamic application security testing vulnerability scanner and web application security tool. It functions as a distributed web audit framework that performs active and passive audits to identify security flaws such as SQL injection and cross-site scripting. The project features a JavaScript-aware web crawler that executes scripts and monitors DOM changes to analyze modern dynamic web applications. It utilizes server platform fingerprinting to target compatible security payloads and provides a grid-based system to distribute scanning workloads across multiple nodes. The tool cov

Xray is a security assessment tool focused on web vulnerability scanning, attack surface mapping, and technology fingerprinting. It identifies common security flaws through automated scanning and semantic analysis, while verifying findings via a custom proof-of-concept execution engine. The system distinguishes itself with a containerized vulnerability testbed used to deploy pre-configured vulnerable applications. This environment allows for the simulation of specific vulnerabilities and edge-case scenarios to validate scanner accuracy and eliminate false positives. The platform covers a bro

Osmedeus is a security workflow orchestration engine that coordinates AI agents, shell commands, and scanning tools through declarative YAML pipelines. It functions as a distributed security scanner, a declarative workflow automator, and an AI agent framework for security, enabling automated multi-step security analysis with conditional branching, parallel execution, and distributed workers. The engine distinguishes itself through a hybrid runner model that executes workflow steps on the local host, inside Docker containers, or over SSH to remote machines, selected per step or module. It supp

WPScan is a security analysis utility and vulnerability scanner designed specifically for auditing WordPress installations and other content management systems. It functions as a web application security tool that identifies misconfigurations, outdated software, and security holes in core installations, plugins, and themes. The tool employs black-box scanning techniques to perform site component enumeration, identifying users, themes, and plugins by matching known file paths and response signatures. It matches these detected components against a database of known security flaws to analyze the

The Swiss Army knife for automated Web Application Testing

Vulnerability scanner based on vulners.com search API

Rengine is an automated reconnaissance framework and vulnerability management platform designed for attack surface monitoring. It functions as a centralized hub for discovering subdomains and open ports, gathering open-source intelligence, and tracking security flaws across target networks. The system integrates large language models to analyze reconnaissance data and generate vulnerability descriptions and insights. It distinguishes itself through a plugin-based tool integration that wraps external security scanning binaries and a target mapping system that tracks changes to assets over time