CVE-2026-38820

Deferred Deferred - Pending Action

Unauthenticated OS Command Injection in openNDS

Publication date: 2026-08-28

Last updated on: 2026-09-09

Assigner: MITRE

Description

openNDS before 11.0.0 is susceptible to unauthenticated OS command execution via shell command injection through the fas query parameter on the /opennds_preauth/ endpoint because of libopennds.sh.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-09

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-38820

EUVD

EUVD-2026-67360

Affected Vendors & Products

Vendor	Product	Version / Range
opends	opends	to 11.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability is an unauthenticated OS command execution flaw in openNDS versions before 11.0.0. It allows attackers to inject shell commands via the fas query parameter on the /opennds_preauth/ endpoint due to improper handling in libopennds.sh.

Detection Guidance

To detect this vulnerability, check if your openNDS version is below 11.0.0. Inspect network traffic for requests to the /opennds_preauth/ endpoint with suspicious fas query parameters containing shell commands. Use tools like curl to test the endpoint: curl -v http://<target>/opennds_preauth/?fas=<command>. If the command executes, the system is vulnerable.

Impact Analysis

An attacker could exploit this to execute arbitrary commands on the affected system, potentially gaining control over the device or network. This could lead to data theft, system compromise, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Immediately upgrade openNDS to version 11.0.0 or later. If upgrading is not possible, restrict access to the /opennds_preauth/ endpoint via firewall rules or disable it entirely. Monitor network traffic for exploitation attempts and apply patches as soon as they are available.

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