Stack-Based Buffer Overflow in TOTOLINK X2000R

Executive Summary

This is a stack-based buffer overflow vulnerability in the Mcli functionality of TOTOLINK X2000R router firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. It allows arbitrary code execution when an attacker sends a specially crafted HTTP request. The vulnerability requires authentication to exploit.

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Detection Guidance

Detecting this vulnerability requires monitoring for unusual HTTP requests targeting the Mcli functionality of TOTOLINK X2000R devices. Check server logs for malformed or excessively long HTTP requests to the affected endpoint. Use network traffic analysis tools like Wireshark to inspect HTTP traffic for anomalies. Ensure intrusion detection systems (IDS) are updated to flag potential buffer overflow attempts.

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Impact Analysis

An attacker could gain control of the affected router, potentially leading to network compromise, data theft, or further attacks within your network. Since it requires authentication, attackers would need valid credentials to exploit it.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection. Organizations using this device may face compliance violations and potential legal consequences.

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Mitigation Strategies

Immediately update the TOTOLINK X2000R firmware to the latest patched version if available. Restrict access to the device's HTTP interface by implementing network-level controls such as firewalls or IP whitelisting. Disable the Mcli functionality if not required. Monitor for any signs of exploitation and apply network segmentation to limit lateral movement.

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