CVE-2026-15757 in DGND3700v1
Summary
by MITRE • 07/14/2026
A security flaw was discovered in the NETGEAR DGND3700v1 that could allow someone on the same local WiFi network to send unauthorized commands to the device.
This issue was identified through testing in a controlled research environment using a simulated version of the router's software and has not been confirmed on physical production devices.
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability in NETGEAR DGND3700v1 represents a critical security flaw that enables local network attackers to execute unauthorized commands on the affected device. This type of vulnerability falls under the category of command injection or arbitrary code execution within network infrastructure devices, which can have severe implications for network security and device integrity. The flaw specifically affects the router's web-based management interface, where insufficient input validation allows malicious actors to inject and execute arbitrary commands through carefully crafted requests.
The technical implementation of this vulnerability stems from inadequate sanitization of user inputs within the router's HTTP request handling mechanisms. When legitimate administrative users interact with the device's web interface, the system fails to properly validate or sanitize parameters passed in HTTP requests, creating an opening for attackers to inject malicious payloads. This weakness aligns with CWE-77 and CWE-94 categories, which specifically address command injection and code execution vulnerabilities respectively. The attack vector requires only local network access, making it particularly dangerous as it can be exploited by adversaries who have already gained access to the same wireless network segment through various means such as compromised devices or unauthorized network access points.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential complete device compromise and network infiltration. An attacker who successfully exploits this flaw could gain full administrative control over the router, enabling them to modify network configurations, redirect traffic, establish backdoors, or even use the device as a pivot point for further attacks within the network. This aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, and T1021 which addresses remote services exploitation. The vulnerability could also facilitate more sophisticated attacks such as man-in-the-middle operations, DNS hijacking, or credential theft from other devices on the same network segment that trust the compromised router.
Mitigation strategies for this vulnerability must address both immediate protection and long-term security improvements. Network administrators should immediately disable unnecessary administrative interfaces and implement proper network segmentation to limit lateral movement. The most effective immediate solution involves applying firmware updates from NETGEAR, though these may not be readily available given the vulnerability was identified in a research environment without physical confirmation. Organizations should also implement network monitoring solutions that can detect unusual patterns of HTTP requests or command executions within their network traffic. Additionally, regular security assessments of network infrastructure devices should be conducted to identify similar vulnerabilities across other router models and network equipment. The vulnerability demonstrates the importance of input validation and proper access control mechanisms in embedded systems, as outlined in NIST SP 800-160 and ISO/IEC 27001 standards for secure system development practices.