CVE-2026-90705
Deferred Deferred - Pending Action

OS Command Injection in D-Link DWR-M921 Router

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: VulDB

Description
A vulnerability was determined in D-Link DWR-M921 1.1.52. This affects the function formsysCmd of the file /boafrm/formsysCmd of the component Boa Dispatch Table. Executing a manipulation of the argument sysCmd can lead to os command injection. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-15
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-90705
EUVD
EUVD-2026-77356

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
d-link dwr-m921 1.1.52

Helpful Resources

Exploitability

CWE
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KEV
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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.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

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Executive Summary

This vulnerability is an OS command injection flaw in the D-Link DWR-M921 router firmware version 1.1.52. It exists in the /boafrm/formSysCmd endpoint where the sysCmd parameter is passed directly to the system shell without input validation. This allows authenticated attackers to execute arbitrary commands with root privileges.

Detection Guidance

To detect this vulnerability, check if your D-Link DWR-M921 router with firmware V1.1.52 is accessible. Verify if the /boafrm/formSysCmd endpoint exists and if the sysCmd parameter can be manipulated to execute commands. Check logs at /tmp/syscmd.log for suspicious command executions.

Impact Analysis

An attacker with access to the router could execute malicious commands, potentially taking control of the device, stealing data, or using it as a pivot point for further attacks. Since the flaw allows root access, the impact is severe and could compromise network security entirely.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations using this router may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Immediately update the router firmware to a patched version if available. If no patch exists, disable the vulnerable handler by removing the /boafrm/formSysCmd endpoint or restrict access to authenticated users only. Implement strict input validation for the sysCmd parameter and use command whitelisting to prevent arbitrary command execution.

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