CVE-2025-12944: Netgear DGN2200 Firmware RCE Vulnerability

CVE-2025-12944 Overview

CVE-2025-12944 is an improper input validation vulnerability [CWE-20] in the NETGEAR DGN2200v4 (N300 Wireless ADSL2+ Modem Router). Attackers with direct network access to the device can potentially execute code on the affected router. The flaw was disclosed in the NETGEAR November 2025 Security Advisories and resolved in firmware version 1.0.0.132 or later.

The vulnerability requires adjacent network access, meaning the attacker must be on the same logical network as the router. No authentication or user interaction is required to exploit the issue, increasing exposure for networks where the router management interface is reachable by untrusted clients.

Critical Impact
Successful exploitation allows unauthenticated attackers on the local network to execute arbitrary code on the router, compromising confidentiality, integrity, and availability of the device.

Affected Products

NETGEAR DGN2200v4 (N300 Wireless ADSL2+ Modem Router) hardware
NETGEAR DGN2200 firmware prior to 1.0.0.132
All deployments exposing the router management interface to adjacent network clients

Discovery Timeline

2025-11-11 - CVE-2025-12944 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-12944

Vulnerability Analysis

The DGN2200v4 fails to properly validate input received over the network before processing it in a privileged context on the device. This [CWE-20] class of weakness occurs when an application accepts attacker-controlled data without enforcing structural, length, or content constraints. On embedded routers, such flaws typically allow injection of unintended commands or payloads into native handler routines.

The attack vector is classified as adjacent network, meaning exploitation requires a foothold on the same broadcast domain or logical network segment. An attacker on the LAN or Wi-Fi network can deliver a crafted request to the router. Because no privileges or user interaction are required, any device that joins the network becomes a potential exploitation source.

Successful code execution on a modem router yields full control over traffic traversing the device. Attackers can pivot to internal hosts, modify DNS settings, intercept credentials, or stage further attacks against connected endpoints. The EPSS score of 0.231% reflects limited public exploitation observation, but the impact on confidentiality, integrity, and availability is rated high.

Root Cause

The root cause is missing or insufficient input validation in a network-reachable service on the DGN2200v4. Input fields are passed to downstream processing logic without sanitization, allowing crafted payloads to alter execution flow on the device.

Attack Vector

An attacker on the adjacent network sends a malformed or unexpected request to the router. The router parses the input without enforcing validation rules, and the malicious payload reaches a code path that can be coerced into executing attacker-supplied instructions. No credentials are required.

No verified proof-of-concept code or public exploit is available for this issue. Refer to the NETGEAR November 2025 Security Advisories for vendor-supplied technical context.

Detection Methods for CVE-2025-12944

Indicators of Compromise

Unexpected configuration changes on the DGN2200v4, including modified DNS servers, port forwarding rules, or administrative credentials
Unusual outbound traffic from the router management IP to unknown external hosts
Reboots, crashes, or service interruptions on the router without an operator action
New or unrecognized firmware build identifiers reported by the device

Detection Strategies

Inventory all NETGEAR DGN2200v4 devices and verify firmware version against 1.0.0.132
Monitor LAN-side traffic patterns directed at the router administrative interface for anomalous request volumes or malformed payloads
Correlate router log exports with network flow telemetry to identify suspicious management-plane activity

Monitoring Recommendations

Centralize router syslog and flow data into a SIEM for long-term retention and correlation
Alert on configuration changes to DNS, WAN, and administrative account settings on the router
Track devices that initiate management-plane traffic and baseline expected administrator workstations

How to Mitigate CVE-2025-12944

Immediate Actions Required

Upgrade DGN2200v4 firmware to 1.0.0.132 or later as published in the NETGEAR November 2025 Security Advisories
Restrict access to the router management interface to a defined administrative subnet or host
Disable remote management features unless explicitly required for operations
Rotate administrative credentials on the router after patching

Patch Information

NETGEAR has released DGN2200v4 firmware 1.0.0.132 to remediate CVE-2025-12944. Download instructions are available on the NETGEAR DGN2200v4 Support Page. Confirm firmware version after upgrade using the router administration console.

Workarounds

Segment the router from untrusted endpoints by placing IoT and guest devices on isolated VLANs or SSIDs
Disable Wi-Fi or wired ports that expose the management interface to unmanaged users until patching is complete
Replace end-of-life hardware with a currently supported router model if firmware updates cannot be applied

bash

# Verify DGN2200v4 firmware version after upgrade
# 1. Log in to the router web administration interface
# 2. Navigate to: Advanced > Administration > Router Status
# 3. Confirm the Firmware Version field reports: 1.0.0.132 or later