CVE-2026-0416: NETGEAR Router Auth Bypass Vulnerability

CVE-2026-0416 Overview

CVE-2026-0416 is an insufficient input validation vulnerability [CWE-20] affecting certain NETGEAR router models. An authenticated administrator with adjacent network access can submit crafted input that bypasses management interface restrictions. Successful exploitation results in unauthorized modification of protected router software or functionality.

The flaw requires high privileges and adjacency to the local network, which limits remote attack feasibility. However, it remains relevant in shared environments, managed service provider deployments, and scenarios where administrative credentials are reused or weakly protected. NETGEAR addressed the issue in its June 2026 security advisory covering affected models including the RAXE450 and RAXE500.

Critical Impact
An authenticated attacker on the adjacent network can modify protected router functionality, undermining the integrity of the device and any traffic it handles.

Affected Products

NETGEAR RAXE450 (Nighthawk Tri-Band WiFi 6E Router)
NETGEAR RAXE500 (Nighthawk Tri-Band WiFi 6E Router)
Additional NETGEAR router models listed in the June 2026 security advisory

Discovery Timeline

2026-06-09 - CVE-2026-0416 published to the National Vulnerability Database (NVD)
2026-06-11 - Last updated in NVD database
June 2026 - NETGEAR releases security advisory and firmware fixes

Technical Details for CVE-2026-0416

Vulnerability Analysis

The vulnerability stems from improper validation of input received through the router's web-based management interface. The firmware accepts administrator-supplied parameters without enforcing the full set of constraints that the management interface is designed to apply. An authenticated administrator can craft input that the validation layer fails to reject, causing the device to act on values outside the intended policy boundaries.

Because the bypass operates against integrity controls rather than authentication, the attacker must already hold administrator credentials and must reach the device over the local network. Once those preconditions are met, the attacker can alter protected configuration or software components that the management interface would otherwise refuse to change. The result is a loss of integrity over router behavior, which can include configuration of routing, filtering, or services that affect every client on the network.

Root Cause

The root cause is classified under [CWE-20] Improper Input Validation. Specific firmware handlers in the management interface do not sufficiently sanitize or constrain parameter values before passing them to functions that modify protected router state. The validation gap allows administrator input to traverse trust boundaries that the interface is meant to enforce.

Attack Vector

Exploitation requires adjacent network access (AV:A) and high privileges (PR:H). A typical attack path involves an authenticated session against the router's LAN-side management interface, where the attacker submits a crafted HTTP request to a vulnerable endpoint. No user interaction is required. Successful requests modify protected software or functionality without triggering the interface's normal restriction logic.

No public proof-of-concept or exploit code is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the NETGEAR Security Advisory June 2026 for vendor-supplied technical details.

Detection Methods for CVE-2026-0416

Indicators of Compromise

Unexpected changes to router configuration, firmware components, or administrative settings outside scheduled maintenance windows.
Administrative logins from unusual LAN clients, particularly from hosts that do not normally manage the device.
New or modified port forwarding, DNS, or firewall rules that do not match documented change records.
Firmware integrity mismatches between the running image and the vendor-published image hash.

Detection Strategies

Monitor the router's management interface logs for high volumes of POST requests to configuration endpoints from a single LAN client.
Compare current device configuration against a known-good baseline on a recurring schedule and alert on drift.
Capture syslog output from the router to a central collector and correlate administrative actions with authorized change tickets.

Monitoring Recommendations

Forward router authentication and configuration logs to a SIEM or log aggregation platform for retention and correlation.
Alert on administrator logins outside business hours or from non-management VLANs.
Track firmware version and configuration checksums across the router fleet and flag unexpected changes.

How to Mitigate CVE-2026-0416

Immediate Actions Required

Apply the firmware update for the affected NETGEAR model as published in the NETGEAR Security Advisory June 2026.
Rotate administrator credentials on all affected devices and ensure each device uses a unique, strong password.
Restrict management interface access to a dedicated management VLAN or specific trusted hosts.
Audit recent administrative activity and configuration changes for signs of unauthorized modification.

Patch Information

NETGEAR has released firmware updates for the affected models. Refer to the model-specific support pages for the RAXE450 and RAXE500 to download the fixed firmware. The vendor advisory lists the minimum firmware versions that contain the fix for each affected model.

Workarounds

Disable remote management and limit web interface access to wired LAN clients until firmware can be applied.
Place the router's management interface behind an access control list that only permits known administrator endpoints.
Enforce multi-factor authentication on accounts that have access to administrator credentials stored in password managers or vaults.
Segment guest and IoT traffic onto separate SSIDs and VLANs to reduce the adjacent attack surface.

bash

# Example: restrict router management to a single admin host using an upstream firewall
# Replace 192.168.1.1 with the router LAN IP and 192.168.1.10 with the admin workstation
iptables -A FORWARD -s 192.168.1.10 -d 192.168.1.1 -p tcp --dport 80  -j ACCEPT
iptables -A FORWARD -s 192.168.1.10 -d 192.168.1.1 -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d 192.168.1.1 -p tcp --dport 80  -j DROP
iptables -A FORWARD -d 192.168.1.1 -p tcp --dport 443 -j DROP