CVE-2026-90703
Received Received - Intake

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 has been found in D-Link DWR-M921 1.1.52. The affected element is the function system of the file /boafrm/formDiskCreateShare. Such manipulation of the argument folderpath leads to os command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-90703
EUVD
EUVD-2026-77345

Affected Vendors & Products

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

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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 is an OS command injection vulnerability in the D-Link DWR-M921 router firmware version 1.1.52. It exists in the web interface's /boafrm/formDiskCreateShare endpoint where the folderpath parameter is improperly sanitized before being used in a system() function call. Attackers can inject malicious commands through this parameter, potentially gaining root access to the device.

Detection Guidance

To detect this vulnerability, check if your D-Link DWR-M921 router is running firmware version V1.1.52. Test the /boafrm/formDiskCreateShare endpoint by sending a request with a manipulated folderpath parameter containing a semicolon followed by a harmless command like 'echo test'. If the response includes output from the injected command, the system is vulnerable.

Impact Analysis

An attacker could exploit this to execute arbitrary commands on your router with root privileges. This could allow them to take control of your network, intercept traffic, install malware, or use your device as part of a botnet. The attack requires authentication but can be performed remotely through the web interface.

Compliance Impact

This vulnerability allows remote command execution as root via OS command injection in the D-Link DWR-M921 router. Such unauthorized access could lead to data breaches, unauthorized data modification, or exfiltration, which directly violates GDPR's data protection requirements and HIPAA's safeguards for protected health information. The lack of input validation and use of unsafe system calls exacerbate the risk of non-compliance with these standards.

Mitigation Strategies

Immediately update the router firmware to a patched version if available. If no patch exists, disable remote access to the web interface and restrict network access to trusted IPs. Implement strict input validation for the folderpath and foldername parameters to block shell metacharacters. Consider replacing the system() function calls with safer alternatives like the mkdir() C API.

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