CVE-2023-46541 in X2000R Gh
Summary
by MITRE • 10/25/2023
TOTOLINK X2000R Gh v1.0.0-B20230221.0948.web was discovered to contain a stack overflow via the function formIpv6Setup.
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Analysis
by VulDB Data Team • 02/17/2026
The vulnerability identified as CVE-2023-46541 affects the TOTOLINK X2000R Gh router model running firmware version 1.0.0-B20230221.0948. This issue manifests as a stack overflow condition within the web interface handling component, specifically within the formIpv6Setup function. The affected device represents a consumer-grade networking appliance that provides internet connectivity and network management capabilities to end users in residential and small office environments. The vulnerability resides in the device's web-based management interface which allows administrators to configure various network parameters including IPv6 settings. This exposure creates a potential attack surface where remote malicious actors could exploit the stack overflow to disrupt service or potentially execute arbitrary code on the affected device.
The technical flaw stems from improper input validation within the formIpv6Setup function, which processes user-supplied data through the web interface. When an attacker submits maliciously crafted data to the IPv6 setup form, the application fails to properly bounds-check the input before copying it onto the stack. This lack of proper validation allows an attacker to overflow the allocated stack buffer, potentially overwriting adjacent memory locations including return addresses and function pointers. The vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite stack data. The stack overflow could enable attackers to manipulate the program execution flow, potentially leading to privilege escalation or complete system compromise depending on the execution environment and memory layout.
The operational impact of this vulnerability extends beyond simple denial of service scenarios. Given that the affected device operates as a network gateway, exploitation could allow attackers to gain unauthorized access to the local network, potentially enabling them to intercept traffic, modify network configurations, or establish persistent access points. The vulnerability affects the device's web management interface, which typically requires authentication but may be accessible to unauthenticated users in certain configurations. Attackers could leverage this vulnerability to execute arbitrary commands with the privileges of the web server process, which often run with elevated permissions on network devices. This could lead to complete compromise of the router and potentially the entire local network segment it serves. The vulnerability also aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation could enable command execution on the affected system.
Mitigation strategies for CVE-2023-46541 should prioritize immediate firmware updates from TOTOLINK, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. The implementation of web application firewalls and intrusion detection systems can help monitor for exploitation attempts targeting the vulnerable formIpv6Setup function. Additionally, disabling unnecessary web management interfaces and restricting access to trusted IP addresses can reduce the attack surface. Regular vulnerability assessments and network monitoring should be conducted to identify other potentially affected devices within the organization's infrastructure. Organizations should also consider implementing network access control policies that prevent direct internet access to network devices that do not require external management access. The vulnerability highlights the importance of secure coding practices and input validation in embedded network devices, emphasizing the need for proper bounds checking and memory management in all user-facing interface components.