CVE-2025-5908 in EX1200T
Summary
by MITRE • 06/10/2025
A vulnerability, which was classified as critical, has been found in TOTOLINK EX1200T up to 4.1.2cu.5232_B20210713. This issue affects some unknown processing of the file /boafrm/formIpQoS of the component HTTP POST Request Handler. The manipulation leads to buffer overflow. The attack may be initiated 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 vulnerability identified as CVE-2025-5908 represents a critical buffer overflow flaw within the TOTOLINK EX1200T router firmware version 4.1.2cu.5232_B20210713 and potentially earlier versions. This security weakness resides in the HTTP POST Request Handler component, specifically within the processing of the /boafrm/formIpQoS file. The flaw manifests when the device receives and processes HTTP POST requests, creating an opportunity for malicious actors to exploit the vulnerable buffer handling mechanism. The buffer overflow vulnerability occurs during the parsing of user-supplied input data, where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The technical exploitation of this vulnerability follows a classic buffer overflow attack pattern that aligns with CWE-121, which describes the condition where a program writes data to a buffer without proper bounds checking. The attack vector is remote, meaning an attacker can trigger the vulnerability without physical access to the device, making it particularly dangerous for networked environments. The exploitation process likely involves crafting a specially formatted HTTP POST request containing malicious data that exceeds the allocated buffer size in the /boafrm/formIpQoS processing module. This overflow can potentially overwrite critical program variables, return addresses, or function pointers, leading to arbitrary code execution or system crashes.
The operational impact of this vulnerability extends beyond simple device compromise, as it affects network infrastructure devices that are often deployed in enterprise and residential environments. Attackers who successfully exploit this vulnerability could gain unauthorized access to the router's administrative interface, potentially leading to complete network compromise. The remote nature of the attack means that threat actors can target devices from anywhere on the internet, making this vulnerability particularly concerning for organizations with exposed router interfaces. The disclosure of exploit details increases the likelihood of widespread exploitation, as security researchers and malicious actors can readily develop working attack payloads.
Security professionals should prioritize immediate mitigation strategies for devices running affected firmware versions, including firmware updates from TOTOLINK if available, network segmentation to isolate affected devices, and monitoring for suspicious network traffic patterns. The vulnerability demonstrates the importance of input validation and proper memory management in embedded network devices, highlighting weaknesses in the HTTP request handling components that should adhere to secure coding practices. Organizations should implement network access controls to prevent unauthorized access to router administrative interfaces and consider deploying intrusion detection systems to monitor for exploitation attempts. This vulnerability also underscores the need for regular firmware updates and security assessments of network infrastructure devices, as many embedded systems remain vulnerable due to delayed patch management and insufficient security testing during development phases. The attack surface for such vulnerabilities is particularly concerning given that routers often serve as central points of network access and control, making them prime targets for attackers seeking persistent access to network environments.