Kubernetes Vulnerability Scanner
Fast, accurate and free online kubernetes vulnerability scanner tool running directly in your browser.
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Kubernetes vulnerability scanner
Perform a quick, non-invasive scan of your Kubernetes cluster for the server API fingerprint, K8s version, potentially anonymous API access (RBAC), and exposure of sensitive endpoints (e.g. kubelet). A tool intended only for testing environments to which you have permissions.
No significant problems were detected based on the tests performed. This is a quick, superficial scan and does not replace a full security audit or a professional vulnerability scanner.
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Other tools you may find usefulKubernetes Vulnerability Scanner - quickly detect risky API endpoints and K8s cluster exposures
Kubernetes Vulnerability Scanner is a lightweight, browser-based tool for the initial security assessment of a Kubernetes cluster, which in one button checks API responses, cluster version, potential anonymous access to resources and kubelet visibility, thanks to which In just a few minutes, you see what your cluster looks like from the perspective of an external observer and can make informed decisions about strengthening security faster.
Instead of installing heavy scanners or preparing complicated scripts, you enter the API address of your Kubernetes cluster or service address, set a response timeout, select whether you want to check basic Kubernetes API endpoints and possible anonymous access to resources, and then run Kubernetes Vulnerability Scanner, which in the background performs a series of secure HTTP queries and returns readable a summary showing, among other things, API status, detected or estimated version, visibility of selected paths, and a list of potential issues sorted by severity.
What exactly does Kubernetes Vulnerability Scanner
Kubernetes Vulnerability Scanner focuses on how your Kubernetes cluster responds to basic HTTP requests from the outside, so it checks, among other things, the availability of the base API address, tries to read the cluster version, analyzes the HTTP response code, reviews selected Kubernetes API endpoints, controls possible anonymous access to namespaces or pods, and for those interested, checks also typical kubelet paths on nodes, which allows you to quickly catch the most obvious and most serious exposure errors.
Scan scope Kubernetes Vulnerability Scanner
- Check whether the given address matches the Kubernetes API, based on headers, response content and characteristic paths.
- Trying to retrieve the cluster version information from the endpoint such as
/versionand analyzing whether the version looks up-to-date or disturbingly outdated. - Test of core Kubernetes API endpoints, including
/api,/apis, as well as selected paths related to the core API. - Optional check for potential anonymous access to resources such as namespaces, pods or deployments using queries without authorization headers.
- Examination of typical kubelet endpoints, where appropriate, to target node administrative interfaces that are clearly overexposed.
- Analyze error messages and response texts for excessively verbose logs, error stacks, and debug information that may suggest details of the environment to an attacker.
What data the scanner doesn't touch and what it doesn't do
- It doesn't try to guess or crack passwords and tokens, it just focuses on how the API responds to regular, unprivileged HTTP requests.
- It does not use specific exploits for known vulnerabilities, its purpose is to indicate potentially dangerous exposures and disturbing responses.
- Does not look deep into the cluster through authorized connections unless the user provides them on their end and uses their own tools.
- Does not modify Kubernetes configuration, does not delete resources or perform write operations, it works in read and recognition mode.
How to use Kubernetes Vulnerability Scanner step by step
The interface has been designed so that an administrator, devops or security engineer can perform the first Kubernetes security scan almost immediately, without reading long documentation and without installing additional binaries, so the whole process comes down to a few logical steps that quickly become a habit.
- In theK8s API or Service Addressfield, enter the address of your cluster, for example
https://k8s.example.com:6443or the address of the gateway through which your services normally communicate, ensuring that you only test environments for which you are responsible. - Set therequest timeout, which is how many seconds Kubernetes Vulnerability Scanner should wait for a response, allowing you to tailor the scan to both fast and slower environments, such as those with restrictive firewalls or long living requests.
- Check whether the scanner shouldfollowredirections, which is useful when your API endpoint redirects to the right address, but can also be a signal to tidy up the configuration and merge traffic under one target URL.
- Enable or disable theoption Check basic API endpointsso that the tool tests paths such as
/versionor/api, which will make it easier to detect unintuitive responses or lack of support for standard endpoints. - Decide whether you want tocheck for potential anonymousaccess to cluster resources, which involves executing unauthorized queries to selected paths such as namespaces, pods, or deployments lists to ensure that RBAC is not set too liberally.
- If necessary, enable testing ofkubeletendpoints if you know that your address leads to a worker node or you have specific solutions in your infrastructure where the kubelet may accidentally be exposed to the world more widely than it should be.
- Click the button to start the scan and wait while Kubernetes Vulnerability Scanner collects the responses, analyzes the headers, statuses, and content of the selected responses, and displays a summary with a list of potential issues detected.
What the Kubernetes Vulnerability Scanner report looks like
After the scan, you receive a clear report, divided into modules, in which you will find both a quick summary of the cluster status and more detailed data on API endpoints, kubelet visibility and potential debug messages, so you can treat this report as the first, high-level risk map for a given Kubernetes environment.
| Report module | What's in | How to interpret it |
|---|---|---|
| Fingerprint Kubernetes and cluster version | Information about whether the Kubernetes API was detected, the estimated or read cluster version, the source of the version information, and the overall risk score. | If the version looks clearly outdated, it is worth verifying the update policy and planning an upgrade, especially in production environments and environments exposed to Internet traffic. |
| API endpoints and their responses | A list of the most important paths, such as/version, /apior other standard endpoints, along with an HTTP status code and a short note. |
Non-standard statuses, empty responses, or surprising content may suggest a non-standard configuration, proxy, or potential issues with proper API exposure. |
| Potential anonymous access | Information about whether selected resources, such as namespaces, pods or deployments, can be accessed without authorization headers. | If responses of 200 or other successes appear on anonymous queries, this may indicate that the permissions are too broad and the RBAC rules need to be clarified. |
| Kubelet Endpoint Exposure | A concise description of whether common kubelet paths are responding and their visibility and behavior towards unauthorized requests. | A bucket visible from the Internet or a wide internal network should usually raise awareness and prompt additional network restrictions or tunnels. |
| Error Messages and Misconfigurations | A set of detected response fragments that appear to be stack traces, debug logs, or detailed system messages, along with a simple assessment of their severity. | Overly verbose errors can reveal component versions, service names, and even pieces of configuration, so when they are detected, it is worth reviewing the error handling logic in your applications. |
Who is Kubernetes Vulnerability Scanner for and when does it make the most sense
Kubernetes Vulnerability Scanner works best wherever you need a quick, preliminary understanding of what the cluster looks like from the outside and what API endpoints are visible to an unauthorized user, therefore it perfectly complements classic observability tools, vulnerability scanners and full penetration tests, which usually require more time and preparations.
Common Usage Scenarios
- A quick check before putting a new Kubernetes cluster into production to make sure the API isn't revealing too much detail or opening unnecessary paths.
- Periodic security health check of existing environments, especially those running in public clouds or in hybrid configurations with multiple entry points.
- Verify changes after upgrading your cluster, migrating to a new version, or modifying your ingress configuration when you want to confirm that nothing has been accidentally opened too much.
- Preparing a concise report for the manager or security team, showing in a simple way the version, visible endpoints and possible anonymous access.
Roles that will particularly benefit from
- DevOps and SREs who combine responsibility for the operation of a Kubernetes cluster with care for its basic network and configuration security.
- System administrators who are new to Kubernetes and need a simple tool to see what exactly is exposed to the world.
- Security professionals for whom Kubernetes Vulnerability Scanner can be the first step in the risk assessment process before a deeper audit.
- Architects and technical leaders who want to quickly confirm that the overall cluster exposure picture is consistent with the organization's adopted security strategy.
Frequently asked questions about Kubernetes Vulnerability Scanner
Can Kubernetes Vulnerability Scanner harm my cluster
The tool performs standard HTTP queries to the indicated endpoints and does not run exploits or destructive operations, so under normal conditions it should not affect the stability of the cluster, although it is always worth remembering that any additional network activity minimally increases the load on the infrastructure and is best perform scans at a time that is not critical to key applications.
Is the scan result a substitute for a full Kubernetes security audit
Kubernetes Vulnerability Scanner is consciously designed to quickly identify and pre-detect the most obvious issues with API exposure, cluster versioning, and anonymous access, so it works great as a first step, but it is not a substitute for a comprehensive audit, manifest configuration review, or in-depth penetration testing that takes much broader context into account and looks for more subtle gaps.
Can I use the scanner on any Kubernetes addresses found on the network
From the perspective of good cybersecurity practices and the regulations of most cloud providers, scanning other people's hosts without the owner's consent is strongly inadvisable, therefore Kubernetes Vulnerability Scanner should only be used on environments that you manage or to which you have formal permissions, and all scans should be part of an agreed security process, not a stand-alone action on foreign addresses.
How often should you run Kubernetes Vulnerability Scanner on the same cluster
In practice, many teams run Kubernetes security scan after major changes to the infrastructure, after updating the cluster version, after modifying ingress or after reorganizing RBAC rules, and also periodically to make sure that nothing new has been accidentally exposed more widely than planned and that the configuration does not drift in a slow but dangerous way.
What to do with the list of potential issues detected by the scanner
As a best practice, once the scan is complete, review the list of issues grouped by severity, start with items marked as more critical, such as anonymous access to resources or an outdated cluster version, and then prepare a short action plan for the technical team to decide which issues can be fixed quickly and which ones require additional analysis, testing or architectural changes.
Run Kubernetes Vulnerability Scanner and see what your cluster looks like from the perspective of an external scan
If you want to check in a few minutes how the Kubernetes API responds, what version of the cluster is visible externally, whether there is no unexpected anonymous access to resources and whether the kubelet has not been accidentally exposed too widely, use Kubernetes Vulnerability Scanner and generate a readable report and treat it as the first step to organizing the cluster exposure before someone from outside your organization does it.
Test your Kubernetes cluster in one click and view a report with Kubernetes Vulnerability Scanner