CVE-2024-9563: D-Link DIR-605L Buffer Overflow Vulnerability

CVE-2024-9563 Overview

CVE-2024-9563 is a buffer overflow vulnerability in the D-Link DIR-605L router running firmware version 2.13B01 BETA. The flaw resides in the formWlanSetup_Wizard function within /goform/formWlanSetup_Wizard. Attackers can trigger the overflow by manipulating the webpage argument. The attack originates over the network and requires low privileges but no user interaction. Public disclosure of the exploit details increases exposure risk for internet-facing devices. The DIR-605L is an end-of-life consumer router, which complicates remediation efforts. This issue is tracked as CWE-120 (Classic Buffer Overflow).

Critical Impact
Remote attackers with low privileges can trigger a buffer overflow to compromise confidentiality, integrity, and availability of the affected D-Link DIR-605L router.

Affected Products

D-Link DIR-605L router (hardware)
D-Link DIR-605L firmware version 2.13B01 BETA
Deployments exposing the web management interface to untrusted networks

Discovery Timeline

2024-10-07 - CVE-2024-9563 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-9563

Vulnerability Analysis

The vulnerability affects the formWlanSetup_Wizard handler in the router's web management interface. This handler processes wireless setup wizard requests submitted through /goform/formWlanSetup_Wizard. The webpage parameter is copied into a fixed-size buffer without proper bounds checking. Supplying an oversized value for webpage corrupts adjacent memory in the HTTP daemon process.

Successful exploitation can result in denial of service through process crashes. Depending on the router's memory protections, attackers may achieve arbitrary code execution as the web server process, which typically runs with elevated privileges on embedded devices. Compromise grants control over routing, DNS, and traffic inspection paths for all connected clients.

Root Cause

The root cause is missing input length validation on the webpage argument before it is copied into a stack or heap buffer. This falls under CWE-120, classic buffer copy without checking size of input. Consumer-grade embedded routers frequently lack modern exploit mitigations such as stack canaries, non-executable stacks, or address space layout randomization (ASLR), which magnifies the impact of overflow bugs.

Attack Vector

An attacker sends a crafted HTTP POST or GET request to /goform/formWlanSetup_Wizard with an overlong webpage parameter. Exploitation requires authenticated access to the web interface, which corresponds to the low privileges requirement. On devices retaining default or weak credentials, or where the management interface is exposed to the internet, this constraint is trivially met. Vulnerability details have been disclosed publicly on the GitHub IoT Vulnerability Document and VulDB #279371.

Detection Methods for CVE-2024-9563

Indicators of Compromise

Unexpected HTTP requests to /goform/formWlanSetup_Wizard containing abnormally long webpage parameter values
Repeated crashes or reboots of the router's HTTP management daemon
Unauthorized changes to wireless configuration, DNS settings, or administrative credentials
Outbound connections from the router to unknown command-and-control infrastructure

Detection Strategies

Inspect network traffic to router management interfaces for oversized parameter values on /goform/* endpoints
Deploy intrusion detection signatures that flag HTTP requests with parameter lengths exceeding expected bounds for D-Link management URIs
Correlate router log anomalies with client-side network disruption events to identify exploitation attempts

Monitoring Recommendations

Enable syslog forwarding from routers to a centralized log aggregator for behavioral baselining
Monitor for management interface exposure on WAN interfaces using external attack surface scans
Alert on new administrator sessions or configuration changes outside authorized maintenance windows

How to Mitigate CVE-2024-9563

Immediate Actions Required

Disable remote WAN administration on the DIR-605L web interface
Restrict LAN-side access to the management interface using ACLs or VLAN segmentation
Rotate administrative credentials and enforce strong, unique passwords
Plan replacement of the DIR-605L with a currently supported router model

Patch Information

D-Link has not published a vendor advisory or firmware update for CVE-2024-9563 in the referenced sources. The DIR-605L is a legacy consumer router and may be outside D-Link's active support lifecycle. Consult the D-Link Official Website for end-of-life notices and replacement guidance. Where a supported successor product is available, migration is the recommended remediation path.

Workarounds

Place the router behind a network segment that restricts access to trusted administrative hosts only
Block inbound HTTP and HTTPS access to the router's management port from untrusted networks at an upstream firewall
Disable the wireless setup wizard if the router supports selective feature toggles in its configuration

bash

# Example upstream firewall rule to block WAN-side access to router management
iptables -A FORWARD -p tcp -d <router-ip> --dport 80 -i <wan-interface> -j DROP
iptables -A FORWARD -p tcp -d <router-ip> --dport 443 -i <wan-interface> -j DROP