Overview
The cybersecurity community has recently discovered a critical vulnerability in popular TOTOLINK routers, specifically the A702R, A3002R, and A3002RU models, which are widely used in both home and business environments. This vulnerability, designated as CVE-2025-4825, has serious implications for the safety and security of digital data. The flaw lies in the HTTP POST Request Handler, affecting the /boafrm/formDMZ file, and it can be exploited remotely via a manipulated argument, possibly leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-4825
Severity: Critical (CVSS Score: 8.8)
Attack Vector: Network (HTTP POST Request)
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 within the HTTP POST Request Handler in TOTOLINK routers. Specifically, the flaw resides in the /boafrm/formDMZ file. By manipulating the ‘submit-url’ argument within an HTTP POST request, an attacker can overflow the buffer and potentially execute arbitrary code or cause a denial of service.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited, using a malicious HTTP POST request:
POST /boafrm/formDMZ HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<<malicious_payload>>The “<
Recommended Mitigation
To mitigate this vulnerability, users should immediately apply the vendor patch once available. As a temporary mitigation, use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to monitor and block suspicious activities.