CVE-2026-107918 in R7300
Summary
by MITRE • 10/13/2026
Insufficient input validation vulnerability in the LAN Setup feature of NETGEAR R7300 router allows authenticated administrators connected to the local network to perform unauthorized actions on the router.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 • 10/13/2026
The vulnerability described constitutes an insufficient input validation flaw within the LAN Setup feature of the NETGEAR R7300 wireless router, classified under CWE-20 as Improper Input Validation. This security defect allows authenticated administrators who are connected to the local network to execute unauthorized actions on the device's firmware configuration. The core technical issue stems from a failure in the backend processing logic to adequately sanitize or verify user-supplied data before it is applied to critical system settings. By exploiting this gap, an attacker with valid administrative credentials can manipulate internal state variables that are not properly constrained by expected value ranges or formats, leading to unintended side effects within the router's operational environment.
From a threat modeling perspective, this vulnerability aligns with MITRE ATT&CK technique T1078, specifically Valid Accounts, as it requires pre-existing authentication privileges on the local network segment. The attacker leverages these legitimate credentials to bypass intended access controls through logic manipulation rather than credential theft or brute force. Because the attack vector is confined to the local area network and requires prior authentication, the scope of exploitation is limited compared to remote code execution vulnerabilities but remains significant for insider threats or compromised endpoints within the trusted zone that have been granted administrative rights.
The operational impact of this vulnerability centers on the potential compromise of router integrity and subsequent network security posture. Unauthorized actions performed via this flaw could include modifying DNS settings, altering firewall rules, disabling logging mechanisms, or changing gateway configurations. Such modifications can facilitate man-in-the-middle attacks, redirect traffic to malicious infrastructure, or degrade the availability and confidentiality of services hosted behind the router. Although the vulnerability allows for unauthorized configuration changes, it does not directly provide remote code execution capabilities on the underlying operating system kernel, which limits its immediate severity in terms of full device takeover but elevates its risk due to the ease of achieving persistent network-level compromise if administrative credentials are obtained through other means such as phishing or weak password policies.
It is critical to note that 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. This distinction implies that while the logical flaw exists within the codebase structure, its actual exploitability may depend on specific runtime conditions or hardware-specific implementations present only in final manufacturing builds. Consequently, organizations should treat this as a potential risk requiring verification rather than an immediate critical incident affecting all deployed units. Mitigation strategies should focus on enforcing strict network segmentation to limit administrative access, implementing multi-factor authentication for router management interfaces where supported, and applying the latest firmware updates provided by NETGEAR that address input validation gaps in the LAN setup module. Regular auditing of configuration changes and monitoring for anomalous administrative activity can further reduce the risk associated with this class of vulnerabilities.