CVE-2026-11814: NETGEAR Command Injection RCE Vulnerability

CVE-2026-11814 Overview

CVE-2026-11814 is a command injection vulnerability affecting multiple NETGEAR router and access point models. A network-adjacent attacker capable of intercepting and modifying local network traffic (attacker-in-the-middle) can exploit the flaw to compromise the confidentiality and integrity of the affected device. The issue stems from improper certificate validation [CWE-295], which enables the attacker to tamper with communications the device implicitly trusts. NETGEAR notes that the issue is limited to certain region-specific SKUs. The vulnerability was published on 2026-08-11 and last updated on 2026-08-12 in the NVD.

Critical Impact
A network-adjacent attacker positioned between the device and a trusted endpoint can inject arbitrary commands, altering device configuration and exposing sensitive data on affected NETGEAR SKUs.

Affected Products

NETGEAR BE9300, R6700AX, and Orbi RBR760/RBS760 mesh systems (region-specific SKUs)
NETGEAR Nighthawk RAX-series routers (RAX10, RAX20, RAX28, RAX29, RAX30, RAX36S, RAX43, RAX45, RAX50, RAX70, RAX120, RAX120v2)
NETGEAR RS-series routers (RS70, RS90, RS100, RS200, RS280, RS300, RS500, RS600) and MR60/MS60 access points

Discovery Timeline

2026-08-11 - CVE CVE-2026-11814 published to NVD
2026-08-12 - Last updated in NVD database
2026-08 - NETGEAR publishes the August 2026 NETGEAR Security Advisory

Technical Details for CVE-2026-11814

Vulnerability Analysis

CVE-2026-11814 combines two weaknesses: improper certificate validation [CWE-295] and downstream command injection. The affected NETGEAR devices fail to properly validate the identity of a remote endpoint they communicate with over the local network. An attacker who can intercept that traffic can substitute their own responses without triggering a trust error.

Because the response data is later passed to a shell or system command handler on the device, the attacker can embed shell metacharacters that the device executes. The result is unauthenticated command execution in the context of the device's firmware services. NETGEAR classifies the issue as limited to region-specific SKUs, indicating that regional firmware branches include the vulnerable code path.

Root Cause

The root cause is missing or incorrect verification of the server certificate presented during a TLS-protected exchange initiated by the device. Without a valid trust chain check or hostname verification, the device accepts a spoofed peer. Data returned by the spoofed peer is then concatenated into a command string executed by the underlying operating system, producing a command injection primitive.

Attack Vector

Exploitation requires the attacker to be network-adjacent, meaning they must reside on the same broadcast domain or in a position to redirect traffic (for example, via ARP spoofing, rogue DHCP, or a compromised upstream device). User interaction is not required. Attack complexity is high because the attacker must first establish the traffic-interception position and must time the injection against a device-initiated request. Once positioned, the attacker can substitute a response, inject shell metacharacters, and coerce the device into executing arbitrary commands.

No public proof-of-concept exploit is currently available for CVE-2026-11814, and it is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the NETGEAR Security Advisory for vendor-specific technical details.

Detection Methods for CVE-2026-11814

Indicators of Compromise

Unexpected TLS certificate errors or certificate mismatches logged by NETGEAR devices during outbound update or telemetry checks.
Unusual ARP table changes, duplicate MAC addresses, or gratuitous ARP traffic on subnets containing affected routers or access points.
New or unrecognized administrator accounts, altered DNS settings, or unexpected outbound connections originating from the router management plane.

Detection Strategies

Inspect network captures for TLS sessions originating from the router where the presented certificate does not chain to a known NETGEAR update or telemetry endpoint.
Correlate router-initiated outbound connections with subsequent configuration changes; a change immediately following an intercepted session is a strong signal.
Deploy network intrusion detection signatures for ARP spoofing, rogue DHCP responses, and LAN-side attacker-in-the-middle patterns targeting management subnets.

Monitoring Recommendations

Forward router syslog and administrative event logs to a central SIEM for baseline and anomaly analysis.
Alert on any firmware version change, factory-reset event, or admin credential modification that occurs outside a scheduled maintenance window.
Monitor DNS queries from router IP addresses for lookups of domains not associated with NETGEAR services.

How to Mitigate CVE-2026-11814

Immediate Actions Required

Identify all NETGEAR devices in scope by model and region SKU, and cross-reference against the August 2026 NETGEAR Security Advisory.
Apply the vendor-supplied firmware update for each affected model as soon as it is available for the relevant region.
Restrict management access to trusted VLANs and disable remote administration on the WAN interface until patching is complete.

Patch Information

NETGEAR has published fixed firmware for the affected models through its August 2026 security advisory. Consult the product-specific support pages for the BE9300, RAX30, RBR760, and other listed models to download the appropriate firmware image for your region-specific SKU.

Workarounds

Segment router management interfaces onto a dedicated VLAN and enforce port security to reduce the risk of an attacker gaining an adjacent network position.
Deploy dynamic ARP inspection and DHCP snooping on managed switches to disrupt attacker-in-the-middle techniques required to exploit this flaw.
Where feasible, disable device features that trigger outbound TLS calls (such as remote telemetry or cloud management) until updated firmware is installed.

bash

# Example switch-side hardening to blunt attacker-in-the-middle prerequisites
# (Cisco IOS syntax; adapt for your platform)
ip dhcp snooping
ip dhcp snooping vlan 10
ip arp inspection vlan 10
interface range GigabitEthernet1/0/1 - 24
 switchport port-security
 switchport port-security maximum 2
 switchport port-security violation restrict