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Ensure there is no unrestricted inbound access to TCP port 9200 (ElasticSearch)

Security & Compliance

TCP port 9200 is commonly used by Elasticsearch, an open-source search engine based on the Lucene library. It is used to provide a RESTful interface for accessing Elasticsearch data. Ensuring that there is no unrestricted inbound access to this port is important for securing Elasticsearch and preventing unauthorized access to data. If there is unrestricted inbound access to port 9200, it could allow an attacker to remotely access and modify Elasticsearch data, which could lead to data breaches and potential data loss.


To remediate the security risk of unrestricted inbound access to TCP port 9200 (ElasticSearch), you can take the following steps:

  1. Configure Elasticsearch to bind only to specific IP addresses and not all interfaces. This can be done by updating the elasticsearch.yml file with the following line: [your_ip_address]
  2. Enable authentication and authorization to control access to Elasticsearch. Elasticsearch supports a number of authentication methods such as basic authentication, SAML, and LDAP. This can be done by updating the elasticsearch.yml file with the following line: true
  3. Configure a firewall to restrict inbound access to port 9200. For example, on a Linux system, you can use iptables or firewalld to create a rule that allows only authorized IP addresses to connect to the port.
  4. Monitor access to Elasticsearch logs and security events to detect any suspicious activity. Elasticsearch provides built-in security and audit logging features that can be enabled to track access and modifications to Elasticsearch data.
Enforced Resources
Note: Remediation steps provided by Lightlytics are meant to be suggestions and guidelines only. It is crucial to thoroughly verify and test any remediation steps before applying them to production environments. Each organization's infrastructure and security needs may differ, and blindly applying suggested remediation steps without proper testing could potentially cause unforeseen issues or vulnerabilities. Therefore, it is strongly recommended that you validate and customize any remediation steps to meet your organization's specific requirements and ensure that they align with your security policies and best practices.
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