CVE-2025-5910 in EX1200T
Summary
by MITRE • 06/10/2025
A vulnerability has been found in TOTOLINK EX1200T up to 4.1.2cu.5232_B20210713 and classified as critical. Affected by this vulnerability is an unknown functionality of the file /boafrm/formWsc of the component HTTP POST Request Handler. The manipulation leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/16/2025
The CVE-2025-5910 vulnerability represents a critical buffer overflow flaw in TOTOLINK EX1200T routers running firmware versions up to 4.1.2cu.5232_B20210713. This vulnerability resides within the HTTP POST Request Handler component, specifically in the /boafrm/formWsc file which serves as a web interface form handler for wireless settings configuration. The flaw manifests when processing malformed HTTP POST requests, creating an opportunity for attackers to execute arbitrary code on the affected device. The vulnerability's classification as critical stems from its remote exploitability and the potential for complete system compromise, making it a significant threat to network security.
The technical exploitation of this buffer overflow occurs through improper input validation within the HTTP POST request handling mechanism. When the router processes a specially crafted POST request containing oversized data in specific parameters, the application fails to properly bounds-check the input before copying it into fixed-length buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially including return addresses, function pointers, or other critical program state information. The vulnerability directly maps to CWE-121, which describes Buffer Overflow in the Stack, and CWE-122, which covers Buffer Overflow in the Heap, both of which are commonly exploited through HTTP request manipulation.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete device compromise and potential network infiltration. Successful exploitation could enable attackers to gain root access to the router's operating system, allowing them to modify network configurations, establish persistent backdoors, redirect traffic through malicious proxies, or use the compromised device as a pivot point for attacking internal network resources. The remote nature of the attack means that threat actors do not require physical access to the device, making this vulnerability particularly dangerous in enterprise and residential networks where router security is often overlooked. This aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1021.001 for Remote Services, as attackers could leverage the compromised device for further network reconnaissance and lateral movement.
Security mitigation strategies for CVE-2025-5910 must prioritize immediate firmware updates from TOTOLINK, as the vendor has likely released patches addressing the buffer overflow condition. Network administrators should implement network segmentation to limit the impact of potential compromise, deploy intrusion detection systems to monitor for suspicious HTTP POST traffic patterns, and consider disabling unnecessary web management interfaces when possible. Additionally, implementing strict access controls through firewalls to restrict access to the router's management interfaces from trusted networks only can provide defense-in-depth protection. The vulnerability demonstrates the critical importance of input validation in web applications and highlights how seemingly minor flaws in HTTP request handling can lead to complete system compromise, reinforcing the need for comprehensive security testing and adherence to secure coding practices throughout the software development lifecycle.