CVE-2026-0415: NETGEAR Router Auth Bypass Vulnerability

CVE-2026-0415 Overview

CVE-2026-0415 is an input validation vulnerability [CWE-20] affecting multiple NETGEAR Orbi mesh router and satellite models. The flaw allows an authenticated administrator with access to the local network to make unauthorized modifications to router software and functionality. Exploitation requires both administrator credentials and adjacent network access, which limits the attack surface to internal actors or attackers who have already compromised the local network. The vulnerability was disclosed in the NETGEAR Security Advisory June 2026.

Critical Impact
An authenticated administrator on the local network can bypass input validation to modify router software and functionality, undermining the integrity of the device.

Affected Products

NETGEAR Orbi router models including RBR750, RBR840, RBR850, RBR860, RBE970, RBRE950, and RBRE960
NETGEAR Orbi satellite models including RBS750, RBS840, RBS850, and RBS860
NETGEAR Orbi satellite models RBSE950 and RBSE960

Discovery Timeline

2026-06-09 - CVE-2026-0415 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-0415

Vulnerability Analysis

The vulnerability stems from improper input validation in administrative interfaces exposed by the affected NETGEAR Orbi routers and satellites. An authenticated administrator can submit crafted input that the device fails to sanitize, leading to unauthorized modification of router software and functionality. Because the attack requires administrator privileges and adjacent network access, exploitation is bounded to scenarios where attackers possess credentials or where insider misuse occurs.

The impact focuses on integrity rather than confidentiality or availability. Modifications to router software can persist across reboots and influence routing, firewall, and service configuration on downstream clients.

Root Cause

The root cause is missing or insufficient input validation [CWE-20] in code paths that accept administrative requests. The affected handlers trust the format and content of supplied parameters without enforcing strict validation, type checks, or allowlists.

Attack Vector

An attacker must first authenticate as an administrator and reach the device over the local or adjacent network. After authentication, the attacker submits crafted input through the administrative interface to alter device software or feature configuration. No verified public proof-of-concept code is available. Refer to the NETGEAR Security Advisory June 2026 for vendor-specific technical details.

Detection Methods for CVE-2026-0415

Indicators of Compromise

Unexpected changes to router firmware version, configuration files, or feature flags on Orbi devices
Administrator login events originating from unusual internal hosts or at atypical times
Unauthorized creation or modification of administrative accounts or service settings

Detection Strategies

Monitor router administrative interfaces for anomalous POST requests containing malformed or unexpected parameters
Compare current device configuration and firmware hashes against a known-good baseline on a recurring schedule
Correlate administrative session activity with network access logs to identify lateral movement preceding configuration changes

Monitoring Recommendations

Forward router syslog and administrative audit events to a centralized logging platform for retention and analysis
Alert on changes to firmware version, admin credentials, or DNS, DHCP, and routing settings on Orbi devices
Track adjacent-network access to the management interface, including Wi-Fi and Ethernet clients that reach the admin portal

How to Mitigate CVE-2026-0415

Immediate Actions Required

Apply the firmware updates listed in the NETGEAR Security Advisory June 2026 to all affected Orbi router and satellite models
Rotate administrator credentials and enforce strong, unique passwords on each device
Audit existing administrator accounts and remove any that are unused or unrecognized

Patch Information

NETGEAR has published fixed firmware versions for the affected Orbi models in the June 2026 advisory. Administrators should consult each product support page, such as RBR850 Support and RBS850 Support, to download the appropriate firmware and apply it through the device management interface.

Workarounds

Restrict access to the router administrative interface to a dedicated management VLAN or trusted subnet
Disable remote management features and limit local management to known administrator devices
Segment guest and IoT networks from the management network to reduce adjacent-network exposure

bash

# Configuration example - restrict management to a trusted subnet (illustrative)
# Replace 192.0.2.0/24 with your administrative subnet
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.0.2.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP