CVE-2025-5907 in EX1200T
Summary
by MITRE • 06/10/2025
A vulnerability classified as critical was found in TOTOLINK EX1200T up to 4.1.2cu.5232_B20210713. This vulnerability affects unknown code of the file /boafrm/formFilter of the component HTTP POST Request Handler. The manipulation leads to buffer overflow. The attack can 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-2025-5907 represents a critical buffer overflow flaw within the TOTOLINK EX1200T router firmware version 4.1.2cu.5232_B20210713 and potentially earlier versions. This issue resides in the HTTP POST Request Handler component, specifically within the /boafrm/formFilter file which serves as a critical interface for handling web-based configuration requests. The buffer overflow vulnerability emerges from insufficient input validation and bounds checking mechanisms within the firmware's web management interface, creating a pathway for malicious actors to exploit the device's network services.
The technical nature of this vulnerability stems from improper handling of user-supplied data within the HTTP POST request processing pipeline. When the router's web interface receives a malformed POST request through the formFilter component, it fails to properly validate or constrain the input data length before copying it into fixed-size memory buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system crashes. The vulnerability's remote exploitability means that attackers do not require physical access to the device, as they can leverage the exposed web management interface from any network location.
The operational impact of this vulnerability extends beyond simple system instability, as it provides attackers with potential full control over the affected router. Successful exploitation could enable malicious actors to modify router configurations, redirect traffic through malicious DNS servers, install persistent backdoors, or use the compromised device as a launch point for further attacks within the local network. The public disclosure of exploitation techniques significantly increases the risk level, as security researchers and threat actors can readily develop and deploy automated attack tools against vulnerable devices. Network administrators face the challenge of identifying exposed devices and implementing immediate mitigations to prevent unauthorized access to their network infrastructure.
Mitigation strategies should prioritize immediate firmware updates from TOTOLINK, as the vendor is likely to release patches addressing the buffer overflow conditions. Network segmentation and access control measures can help limit the potential impact by restricting direct access to administrative interfaces from untrusted networks. Implementing network monitoring solutions that detect unusual traffic patterns or malformed HTTP requests can provide early warning of exploitation attempts. The vulnerability aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions, and may map to ATT&CK technique T1059.007 for command and script interpreter usage. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting web application interfaces and ensure that administrative interfaces are not exposed to public internet access.