Overview
The world of cybersecurity has once again been jolted by a potentially devastating vulnerability that has been discovered in TOTOLINK’s A702R, A3002R, and A3002RU 3.0.0-B20230809.1615. Given the identifier CVE-2025-4830, this vulnerability is of a critical nature and needs to be addressed by users and administrators immediately. Affecting an unknown part of the file /boafrm/formSysCmd in the HTTP POST Request Handler, this vulnerability allows for buffer overflow due to the manipulation of the argument submit-url. This makes TOTOLINK routers susceptible to remote attacks, which can potentially lead to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-4830
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A702R | 3.0.0-B20230809.1615
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability in TOTOLINK routers. Buffer overflow occurs when the volume of data exceeds the storage capacity of the buffer, causing the extra data to overflow into adjacent storage. In this instance, manipulation of the ‘submit-url’ argument leads to buffer overflow in the /boafrm/formSysCmd file of the HTTP POST Request Handler. This can be exploited remotely by an attacker to execute arbitrary code or disrupt the service, leading to potential system compromise or data leakage.
Conceptual Example Code
Below is a conceptual example of how this vulnerability might be exploited. The following HTTP request may cause buffer overflow by sending an oversized ‘submit-url’ argument.
POST /boafrm/formSysCmd HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<oversized data>Please note, the above code is a conceptual example and the actual exploit may vary depending on the specifics of the vulnerable system.