CVE-2026-71948 in DWR-M961
Summary
by MITRE • 08/08/2026
D-Link DWR-M961 devices with hardware version C1 and firmware version before 1.1.5_C1_202607071108 contain a command injection vulnerability in the /boafrm/formDebugDiagnosticRun interface. A remote attacker can inject arbitrary malicious commands into the host field, resulting in command execution with root privileges.
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Analysis
by VulDB Data Team • 08/09/2026
The D-Link DWR-M961 router series represents a class of enterprise-grade wireless broadband routers designed for small to medium business environments, with hardware version C1 and firmware versions prior to 1.1.5_C1_202607071108 being particularly vulnerable to a critical command injection flaw. This vulnerability exists within the web-based management interface at the /boafrm/formDebugDiagnosticRun endpoint, which is accessible to remote attackers without authentication. The flaw stems from inadequate input validation and sanitization of user-supplied data in the host field parameter, allowing malicious actors to inject arbitrary commands that are subsequently executed by the underlying operating system with elevated privileges.
The technical nature of this vulnerability aligns with CWE-77, known as "Command Injection," which occurs when application code incorporates user-controllable data into system command calls without proper sanitization. The affected device operates on a Linux-based embedded system where the web server process executes diagnostic commands through shell invocations. When an attacker submits malicious input containing shell metacharacters such as semicolons, ampersands, or backticks in the host field, these characters are interpreted by the shell and executed as additional commands. Since the diagnostic interface runs with root privileges due to the nature of system-level diagnostic operations, successful exploitation grants complete administrative control over the device, including the ability to modify network configuration, extract sensitive data, or establish persistent access points.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a complete backdoor into the network infrastructure. Network administrators who rely on these devices for critical connectivity may find their entire network compromised if they do not immediately patch affected systems. The vulnerability enables several attack vectors including but not limited to remote code execution, data exfiltration, and man-in-the-middle attacks against internal network traffic. Attackers can leverage this flaw to establish persistent access, install malware, or use the device as a pivot point for further network reconnaissance and lateral movement. This particular vulnerability also demonstrates weaknesses in secure coding practices and input validation mechanisms within embedded web interfaces, making it an attractive target for both automated exploitation tools and sophisticated threat actors.
Mitigation strategies should prioritize immediate firmware updates from D-Link to version 1.1.5_C1_202607071108 or later, which contain proper input sanitization and command execution restrictions. Network segmentation practices should isolate these devices from critical network segments, while implementing firewall rules that restrict access to the web management interface to trusted IP addresses only. Regular security audits of embedded device configurations are essential to identify similar vulnerabilities in other network equipment, particularly considering that many IoT and embedded systems suffer from similar command injection flaws due to insufficient input validation. Organizations should also implement continuous monitoring for unauthorized access attempts and ensure that default credentials are changed immediately upon device deployment. The vulnerability serves as a reminder of the importance of applying security patches promptly and maintaining inventory control over all network devices, particularly those with exposed web interfaces, as highlighted by ATT&CK technique T1059.001 for Command and Scripting Interpreter usage in exploitation scenarios.