CVE-2026-71944 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/formLtefotaUpgradeQuectel interface. A remote attacker can inject arbitrary malicious commands into the fota_url field, resulting in command execution with root privileges.
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Analysis
by VulDB Data Team • 08/08/2026
The D-Link DWR-M961 cellular router series represents a class of network infrastructure devices commonly deployed in enterprise and industrial environments for wireless connectivity management. These devices operate as critical components within communication networks, handling firmware updates and maintaining operational continuity for remote sites. The vulnerability affects specific hardware revision C1 units running firmware versions prior to 1.1.5_C1_202607071108, creating a significant security exposure that extends beyond typical consumer-grade device vulnerabilities. This particular model incorporates LTE connectivity capabilities through Quectel modules, making it essential for maintaining secure communication links in various operational contexts.
The technical flaw manifests within the /boafrm/formLtefotaUpgradeQuectel web interface where input validation mechanisms fail to properly sanitize user-supplied data in the fota_url parameter. This represents a classic command injection vulnerability that operates at the application layer, allowing attackers to execute arbitrary system commands with elevated privileges. The vulnerability stems from improper handling of user inputs within the device's firmware web management interface, specifically targeting the firmware over-the-air update mechanism that processes cellular module updates through Quectel components. When an attacker submits malicious input into the fota_url field, the system fails to properly escape or validate special characters, enabling direct command execution within the device's operating environment.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with root-level access to the device's underlying operating system. This elevated privilege level enables comprehensive system compromise including full read/write access to device memory, network configuration modifications, and potential lateral movement within the network infrastructure. Attackers can leverage this vulnerability to establish persistent backdoors, exfiltrate sensitive network information, or use the compromised device as a pivot point for attacking other systems within the same network segment. The remote nature of the attack vector eliminates the need for physical access to the device, making it particularly dangerous for deployments in unattended locations or critical infrastructure environments.
Security professionals should recognize this vulnerability as aligning with CWE-77 and CWE-78 within the Common Weakness Enumeration framework, specifically addressing command injection flaws that enable arbitrary code execution. The attack pattern corresponds to techniques documented in the MITRE ATT&CK framework under T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. Organizations should immediately implement firmware updates to version 1.1.5_C1_202607071108 or later, as provided by D-Link security advisories. Network segmentation measures should be implemented to limit access to these devices, while monitoring systems should be configured to detect anomalous traffic patterns associated with firmware update requests. Additional mitigations include disabling unnecessary web interfaces when not actively required for management purposes and implementing strict access controls through firewalls to restrict communication to only trusted administrative hosts.
The vulnerability demonstrates the critical importance of secure input validation in embedded network devices, particularly those handling firmware update mechanisms that require elevated privileges. It highlights how seemingly routine administrative functions can become attack vectors when proper security controls are not implemented. Organizations should conduct comprehensive inventory audits to identify all affected DWR-M961 devices within their network infrastructure and prioritize remediation efforts based on risk assessment criteria. Regular vulnerability scanning and penetration testing should be implemented to detect similar issues in other network infrastructure components, as this type of command injection vulnerability often indicates broader security weaknesses within embedded system architectures that may affect multiple device types or vendors.