Overview
The cybersecurity world has been rocked by a new vulnerability found in TOTOLINK A702R firmware version 4.0.0-B20211108.1423. This vulnerability, dubbed CVE-2025-9782, affects the function sub_4466F8 of the file /boafrm/formOneKeyAccessButton and is of particular concern due to its high CVSS Severity Score of 8.8. This vulnerability opens the door to potential system compromise or data leakage, making it a significant risk to any users, businesses, or organizations that employ the affected TOTOLINK firmware.
Given that the exploit can be initiated remotely and has been made public, the urgency for addressing this vulnerability increases. This blog post aims to provide a comprehensive understanding of this vulnerability, its potential impact, and how it may be mitigated or patched.
Vulnerability Summary
CVE ID: CVE-2025-9782
Severity: High (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 | 4.0.0-B20211108.1423
How the Exploit Works
CVE-2025-9782 is a buffer overflow vulnerability. It arises from improper validation of user-supplied input within the ‘submit-url’ argument in the ‘sub_4466F8’ function of the ‘/boafrm/formOneKeyAccessButton’ file. An attacker can exploit this to overflow the buffer by providing a longer argument than expected. This could lead to the execution of arbitrary code or even allow the attacker to take control of the system.
Conceptual Example Code
Please note that the following is a conceptual example and is not intended to work in a real-world scenario. It demonstrates how an attacker might exploit the vulnerability:
POST /boafrm/formOneKeyAccessButton HTTP/1.1
Host: victim.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>In this example, `
Recommended Mitigation
Users of TOTOLINK A702R firmware version 4.0.0-B20211108.1423 are advised to apply the vendor patch as soon as it is available. In the meantime, users can implement Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) as a temporary mitigation measure to detect and block attempts to exploit the vulnerability.
