CVE-2026-71956 in DWR-M961
Summary
by MITRE • 08/08/2026
D-Link DWR-M961 devices with hardware version C1 and software version 1.1.2_C1_202602110044 contain a command injection vulnerability in the app.cgi interface. A remote attacker can inject arbitrary malicious commands into the netDig.ping.dst 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 router series represents a line of enterprise-grade wireless broadband routers designed for small to medium business environments. These devices operate with hardware version C1 and software version 1.1.2_C1_202602110044, which contains a critical command injection vulnerability that affects the application interface known as app.cgi. This vulnerability specifically targets the netDig.ping.dst field within the device's web management interface, creating an avenue for remote exploitation that can result in complete system compromise with root level privileges.
The technical flaw manifests through improper input validation and sanitization within the app.cgi component of the router's web server implementation. When a remote attacker submits malicious input into the netDig.ping.dst parameter, the system fails to properly sanitize or escape the user-supplied data before incorporating it into system commands executed by the underlying operating system. This vulnerability falls under the common weakness enumeration CWE-77 which specifically addresses command injection flaws in software applications, where untrusted data is directly incorporated into shell commands without proper sanitization measures. The vulnerability allows an attacker to inject arbitrary commands that are subsequently executed with the highest privileges available to the web server process, which in this case corresponds to root access.
The operational impact of this vulnerability extends far beyond simple remote code execution, as it provides attackers with complete administrative control over the affected router. With root privileges, an attacker can modify network configurations, establish persistent backdoors, redirect traffic through malicious proxies, disable security features, and potentially use the compromised device as a launching point for attacks against other systems within the local network. The attack surface is particularly concerning because these routers are typically deployed in business environments where they serve as critical network infrastructure components, making them attractive targets for adversaries seeking to establish persistent access or conduct man-in-the-middle attacks.
According to the attack technique framework, this vulnerability maps directly to ATT&CK technique T1059.001 which describes command and scripting interpreter usage, specifically focusing on the execution of commands through shell interfaces. The remote nature of the attack means that no physical access or local network presence is required for exploitation, making it particularly dangerous in environments where network segmentation is not properly implemented. Organizations using these affected D-Link devices should immediately implement network monitoring to detect potential exploitation attempts and consider deploying intrusion detection systems that can identify malicious command injection patterns within HTTP traffic.
Mitigation strategies for this vulnerability include immediate firmware updates from D-Link to address the command injection flaw, though organizations should verify that the update properly resolves the issue without introducing new vulnerabilities. Network segmentation should be implemented to limit access to these devices to authorized personnel only, and the use of firewall rules to restrict access to the app.cgi interface from untrusted networks is strongly recommended. Additionally, implementing network monitoring solutions that can detect command injection attempts in HTTP requests will provide early warning capabilities for potential exploitation attempts. Organizations should also consider disabling unnecessary web management interfaces when possible, as this reduces the attack surface available to potential attackers seeking to exploit this and similar vulnerabilities within their network infrastructure.