CVE-2025-4980: Netgear DGND3700 Information Disclosure Flaw

CVE-2025-4980 Overview

CVE-2025-4980 is an information disclosure vulnerability in the Netgear DGND3700 wireless router running firmware version 1.1.00.15_1.00.15NA. The flaw resides in the mini_http component and is triggered by requests to the /currentsetting.htm endpoint. An unauthenticated remote attacker can retrieve sensitive device configuration data over the network. The issue is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The exploit has been publicly disclosed, and other Netgear products sharing the same web interface code may also be affected.

Critical Impact
Remote unauthenticated attackers can query /currentsetting.htm on exposed DGND3700 routers to harvest configuration details useful for follow-on attacks against the device or the network behind it.

Affected Products

Netgear DGND3700 hardware revision v2
Netgear DGND3700 firmware 1.1.00.15_1.00.15NA
Other Netgear devices sharing the mini_http implementation may be affected

Discovery Timeline

2025-05-20 - CVE-2025-4980 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4980

Vulnerability Analysis

The Netgear DGND3700 exposes an HTTP endpoint at /currentsetting.htm through its embedded mini_http web server. The endpoint returns device configuration attributes in a plain text response without enforcing authentication or session validation. Attackers can send an unauthenticated HTTP GET request to the router's management interface and receive information such as firmware version, model identifier, and other configuration values.

The attack is executed over the network with low complexity and requires no user interaction. When the router's web interface is reachable from the WAN, the endpoint is directly harvestable at internet scale. Even when limited to the LAN, any client on the network, including compromised IoT devices, can query the endpoint to fingerprint the router and plan further exploitation.

Root Cause

The root cause is missing access control on a diagnostic URL served by mini_http. The handler for /currentsetting.htm returns configuration attributes before the request reaches the authentication layer used by the rest of the administrative interface. This aligns with CWE-200, where sensitive data is returned to a caller that has not been authorized to view it.

Attack Vector

Exploitation requires only an HTTP client capable of reaching the router's management interface. An attacker issues a GET request to /currentsetting.htm on the router's IP address and parses the response. Technical details of the request format and response contents are documented in the public GitHub write-up for DGND3700v2 and the VulDB entry #309640. No code example is provided here because verified exploit code was not published with the disclosure.

Detection Methods for CVE-2025-4980

Indicators of Compromise

HTTP GET requests to /currentsetting.htm from external IP addresses against internet-facing Netgear routers
Repeated scanning activity from a single source enumerating multiple router management ports (TCP/80, TCP/8080, TCP/443)
Unexpected outbound responses from the router's WAN interface containing model or firmware strings

Detection Strategies

Inspect perimeter web proxy or firewall logs for HTTP requests targeting currentsetting.htm and correlate with the router's public IP address
Deploy network-based signatures on the intrusion detection system to alert on the URI pattern /currentsetting.htm in HTTP traffic
Baseline the routers' management interface exposure using external attack surface tooling and flag any DGND3700 devices reachable from the internet

Monitoring Recommendations

Forward router access logs to a central log platform and alert on unauthenticated hits to diagnostic endpoints
Monitor DNS and NetFlow data for reconnaissance patterns preceding requests to router management pages
Track firmware version strings observed in responses to detect exposed vulnerable devices within the environment

How to Mitigate CVE-2025-4980

Immediate Actions Required

Restrict the router's web management interface to trusted LAN clients and disable remote administration over the WAN
Place vulnerable DGND3700 units behind an upstream firewall that blocks inbound HTTP to the device
Rotate any credentials or network secrets that could be inferred from the disclosed configuration data

Patch Information

No vendor patch has been referenced in the NVD entry for CVE-2025-4980. The DGND3700 is a legacy product, and administrators should consult the Netgear support portal for firmware availability and consider replacing the device with a currently supported model if no fix is issued.

Workarounds

Block inbound TCP/80 and TCP/8080 to the router's WAN interface at the upstream firewall or ISP-managed device
Add an access control list rule on the router restricting the management interface to a specific administrative subnet
Segment the router's management VLAN away from general user and IoT networks to reduce internal exposure

bash

# Example upstream firewall rule to block WAN-side access to the router web UI
iptables -A FORWARD -p tcp -d <router_wan_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <router_wan_ip> --dport 8080 -j DROP
iptables -A FORWARD -p tcp -d <router_wan_ip> --dport 443 -j DROP