Nuclei is a fast tool for configurable targeted scanning based on templates offering massive extensibility and ease of use.

Nuclei is used to send requests across targets based on a template leading to zero false positives and providing effective scanning for known paths. Main use cases for nuclei are during initial reconnaissance phase to quickly check for low hanging fruits or CVEs across targets that are known and easily detectable. It uses retryablehttp-go library designed to handle various errors and retries in case of blocking by WAFs, this is also one of our core modules from custom-queries.

We have also open-sourced a template repository to maintain various type of templates, we hope that you will contribute there too. Templates are provided in hopes that these will be useful and will allow everyone to build their own templates for the scanner. Checkout the templating guide at nuclei.projectdiscovery.io for a primer on nuclei templates.

Resources

• Resources
• Features
• Usage
• Installation Instructions
  • From Binary
  • From Source
  • From Github
• Nuclei templates
• Running nuclei
  • 1. Running nuclei with a single template.
  • 2. Running nuclei with multiple templates.
  • 3. Automating nuclei with subfinder and any other similar tool.
  • 4. Running nuclei in a Docker
• Thanks

Features

• Simple and modular code base making it easy to contribute.
• Fast And fully configurable using a template based engine.
• Handles edge cases doing retries, backoffs etc for handling WAFs.
• Smart matching functionality for zero false positive scanning.

Usage

nuclei -h

This will display help for the tool. Here are all the switches it supports.

Flag	Description	Example
-c	Number of concurrent requests (default 10)	nuclei -c 100
-l	List of urls to run templates	nuclei -l urls.txt
-target	Target to scan using templates	nuclei -target hxxps://example.com
-t	Templates input file/files to check across hosts	nuclei -t git-core.yaml
-t	Templates input file/files to check across hosts	nuclei -t nuclei-templates/cves/
-nC	Don't Use colors in output	nuclei -nC
-json	Prints and write output in json format	nuclei -json
-json-requests	Write requests/responses for matches in JSON output	nuclei -json -json-requests
-o	File to save output result (optional)	nuclei -o output.txt
-pbar	Enable the progress bar (optional)	nuclei -pbar
-silent	Show only found results in output	nuclei -silent
-retries	Number of times to retry a failed request (default 1)	nuclei -retries 1
-timeout	Seconds to wait before timeout (default 5)	nuclei -timeout 5
-debug	Allow debugging of request/responses.	nuclei -debug
-update-templates	Download and updates nuclei templates	nuclei -update-templates
-update-directory	Directory for storing nuclei-templates(optional)	nuclei -update-directory templates
-v	Shows verbose output of all sent requests	nuclei -v
-version	Show version of nuclei	nuclei -version
-proxy-url	Proxy URL	nuclei -proxy-url hxxp://127.0.0.1:8080
-proxy-socks-url	Socks proxy URL	nuclei -proxy-socks-url socks5://127.0.0.1:8080
-H	Custom Header	nuclei -H "x-bug-bounty: hacker"

Installation Instructions

From Binary

The installation is easy. You can download the pre-built binaries for your platform from the Releases page. Extract them using tar, move it to your $PATHand you're ready to go.

https://github.com/projectdiscovery/nuclei/releases
tar -xzvf nuclei-linux-amd64.tar.gz
mv nuclei /usr/local/bin/
nuclei -h

From Source

nuclei requires go1.14+ to install successfully. Run the following command to get the repo -

> GO111MODULE=on go get -u -v github.com/projectdiscovery/nuclei/v2/cmd/nuclei

In order to update the tool, you can use -u flag with go get command.

From Github

git clone https://github.com/projectdiscovery/nuclei.git
cd nuclei/v2/cmd/nuclei/
go build .
mv nuclei /usr/local/bin/
nuclei -h

Nuclei templates

You can download or update the nuclei templates using update-templates flag.

> nuclei -update-templates

or download it from nuclei templates Github project.

> git clone https://github.com/projectdiscovery/nuclei-templates.git

Please refer to this guide to writing your own custom templates.

Running nuclei

1. Running nuclei with a single template.

This will run the tool against all the hosts in urls.txt and returns the matched results.

> nuclei -l urls.txt -t files/git-core.yaml -o results.txt

You can also pass the list of hosts at standard input (STDIN). This allows for easy integration in automation pipelines.

This will run the tool against all the hosts in urls.txt and returns the matched results.

> cat urls.txt | nuclei -t files/git-core.yaml -o results.txt

2. Running nuclei with multiple templates.

This will run the tool against all the hosts in urls.txt with all the templates in the path-to-templates directory and returns the matched results.

> nuclei -l urls.txt -t cves/ -o results.txt 

3. Automating nuclei with subfinder and any other similar tool.

> subfinder -d hackerone.com -silent | httpx -silent | nuclei -t cves/ -o results.txt

Running in a Docker Container

You can use the nuclei dockerhub image. Simply run -

> docker pull projectdiscovery/nuclei

• After downloading or building the container, run the following:

> docker run -it projectdiscovery/nuclei

For example, this will run the tool against all the hosts in urls.txt and output the results to your host file system:

> cat urls.txt | docker run -v /path-to-nuclei-templates:/go/src/app/ -i projectdiscovery/nuclei -t ./files/git-config.yaml > results.txt

Remember to change /path-to-nuclei-templates to the real path on your host file system.

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Thanks

nuclei is made with 🖤 by the projectdiscovery team. Community contributions have made the project what it is. See the Thanks.md file for more details.

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