CVE-2026-0406 in XR1000v2
Summary
by MITRE • 01/13/2026
An insufficient input validation vulnerability in the NETGEAR XR1000v2 allows attackers connected to the router's LAN to execute OS command injections.
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Analysis
by VulDB Data Team • 02/21/2026
The CVE-2026-0406 vulnerability represents a critical security flaw in NETGEAR XR1000v2 routers that stems from inadequate input validation mechanisms within the device's web-based management interface. This vulnerability specifically affects the router's Local Area Network connectivity, creating a pathway for authenticated attackers who have access to the LAN segment to perform OS command injection attacks. The flaw exists in the router's handling of user-supplied input parameters, where insufficient sanitization allows malicious payloads to be interpreted as legitimate system commands rather than benign input data. This type of vulnerability falls under the CWE-20 category, which encompasses "Improper Input Validation" and represents a fundamental security weakness that enables attackers to manipulate the intended behavior of the system through crafted input sequences.
The technical exploitation of this vulnerability occurs when an attacker with LAN access submits malicious input through the router's web interface, typically through form fields or API endpoints that process user data without proper validation or sanitization. The injection occurs because the router's command processing logic does not adequately filter or escape special characters that could be interpreted by the underlying operating system as command delimiters or execution operators. This allows an attacker to inject arbitrary OS commands that execute with the privileges of the web server process, which typically runs with elevated permissions on the router's operating system. The attack vector is particularly concerning because it requires only LAN access, which is often considered a trusted network segment, making the exploitation more likely in environments where internal network segmentation is not properly enforced.
The operational impact of CVE-2026-0406 extends beyond simple unauthorized command execution, as it provides attackers with potential access to sensitive router configuration data, network traffic analysis capabilities, and the ability to modify network settings. Successful exploitation could enable attackers to redirect network traffic through compromised devices, establish persistent backdoors, or use the router as a pivot point for further attacks within the network. This vulnerability aligns with ATT&CK technique T1059.001, which covers "Command and Scripting Interpreter: PowerShell" and similar execution methods, though in this case the attack occurs through the router's native command processing rather than through PowerShell or other scripting interpreters. The compromised router could also serve as a platform for more sophisticated attacks such as DNS tunneling, port scanning of internal network segments, or even as a staging area for malware distribution to other network devices.
Mitigation strategies for this vulnerability should include immediate firmware updates from NETGEAR to address the input validation flaws, along with network segmentation practices that isolate critical network segments from general LAN access. Network administrators should implement strict access controls and monitoring of router management interfaces to detect suspicious command execution patterns. Additionally, the principle of least privilege should be applied to router management access, limiting the number of users with administrative privileges and ensuring that management interfaces are not directly accessible from untrusted network segments. Organizations should also consider implementing network-based intrusion detection systems that can identify command injection patterns and alert security teams to potential exploitation attempts. The vulnerability demonstrates the importance of input validation in embedded systems and web applications, reinforcing the need for comprehensive security testing including fuzzing and penetration testing of network device interfaces to identify similar weaknesses before they can be exploited by malicious actors.