CVE-2024-31814 in EX200
Summary
by MITRE • 04/08/2024
TOTOLINK EX200 V4.0.3c.7646_B20201211 allows attackers to bypass login through the Form_Login function.
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2024-31814 affects the TOTOLINK EX200 router model running firmware version V4.0.3c.7646_B20201211. This issue resides within the Form_Login function of the device's web interface, representing a critical authentication bypass flaw that could allow unauthorized access to network administration controls. The vulnerability stems from inadequate input validation and authentication mechanism implementation within the router's web management portal.
The technical flaw manifests through improper handling of login form parameters that enables attackers to circumvent the standard authentication process. Specifically, the Form_Login function fails to properly validate user credentials or implement adequate session management controls, allowing malicious actors to gain administrative access without proper authentication. This weakness operates at the application layer and affects the router's web-based management interface, which typically requires valid credentials for access to configuration settings, firmware updates, and network management functions.
The operational impact of this vulnerability is severe as it provides attackers with full administrative privileges over the affected router. Once exploited, unauthorized users can modify network configurations, change administrator passwords, disable security features, install malicious firmware, or redirect network traffic through DNS hijacking. The vulnerability affects both local and remote access scenarios, as the web interface is typically accessible from the local network and often exposed to the internet through port forwarding or remote management features. This creates a significant risk for home and small office networks where routers are often configured with default credentials and lack proper network segmentation.
Security researchers have classified this issue as a direct violation of authentication controls and input validation principles, aligning with CWE-287 which addresses improper authentication vulnerabilities. The flaw also maps to ATT&CK technique T1078 which covers valid accounts and T1566 which covers credential harvesting through various attack vectors. Organizations using affected TOTOLINK EX200 devices should immediately implement mitigations including firmware updates from the vendor, network segmentation to isolate management interfaces, and disabling remote management features where possible. Additionally, implementing strong network access controls and monitoring for unauthorized access attempts can help detect exploitation attempts. The vulnerability highlights the importance of proper authentication implementation in network devices and underscores the need for regular firmware updates and security assessments of network infrastructure components.