CVE-2026-82680 in DSM-G600
Summary
by MITRE • 08/31/2026
A weakness has been identified in D-Link DSM-G600 1.01. This affects an unknown function of the file /load_file.cgi of the component Multipart Handler. Executing a manipulation can lead to out-of-bounds write. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 08/31/2026
The D-Link DSM-G600 router, specifically running firmware version 1.01, contains a critical security vulnerability within its web management interface that allows remote attackers to execute arbitrary code on the target device. This flaw is located in the /load_file.cgi script, which serves as an entry point for handling multipart form data uploads. The underlying technical issue stems from improper validation of input parameters passed to this handler, resulting in a classic out-of-bounds write condition. When a maliciously crafted HTTP request containing specially manipulated multipart data is processed by the server, it triggers a buffer overflow that writes data beyond the allocated memory boundaries. This type of error typically corrupts adjacent memory structures or overwrites critical control flow data such as return addresses on the stack, thereby allowing an attacker to redirect program execution to shellcode injected via the same request.
From a technical perspective, this vulnerability is categorized under CWE-120, which describes buffer copy without checking size limits, and more specifically relates to out-of-bounds write scenarios where memory integrity is compromised. The presence of public exploits significantly elevates the risk profile of this flaw, as it lowers the barrier for entry for threat actors who may not possess advanced reverse engineering skills. Attackers can leverage automated scanning tools or pre-packaged exploit scripts to identify vulnerable instances across the internet and launch attacks without needing prior authentication in many configurations where remote management is enabled. The ability to execute code remotely means that an attacker can gain full control over the router, effectively turning it into a node within a botnet or using it as a pivot point for further lateral movement into internal networks.
The operational impact of this vulnerability extends beyond simple device compromise. Once an attacker gains root access through memory corruption and code execution, they can modify DNS settings to redirect users to phishing sites, intercept unencrypted traffic, install persistent backdoors, or disable logging mechanisms to cover their tracks. Given that routers often serve as the primary gateway for home and small business networks, compromising this device exposes all connected devices to potential surveillance and manipulation. The lack of input sanitization in the multipart handler highlights a fundamental weakness in how legacy embedded systems handle complex HTTP payloads, reflecting broader industry challenges with maintaining secure codebases in resource-constrained environments where rigorous testing cycles may be limited due to time-to-market pressures.
Mitigation strategies for this vulnerability primarily involve immediate firmware updates if available from D-Link, as newer versions likely include patches that validate input lengths and implement bounds checking before memory operations occur. In cases where patching is not immediately feasible or possible due to end-of-life status, network-level controls should be implemented to restrict access to the router's management interface. This includes disabling remote administration features entirely unless absolutely necessary, restricting administrative ports to specific trusted IP addresses via firewall rules, and ensuring that strong, unique passwords are used for all user accounts. Additionally, monitoring network traffic for anomalous HTTP requests targeting CGI scripts can help in detecting attempted exploitation activities before successful compromise occurs. Organizations should also consider segmenting IoT devices into separate VLANs with restricted access policies to limit the blast radius of any potential breach.