Overview
A newly discovered vulnerability in TOTOLINK A3002R and A3002RU routers, identified as CVE-2025-4730, poses a serious threat to network security. This critical-rated vulnerability resides in an unknown functionality of the file /boafrm/formMapDel and can be exploited via an HTTP POST request. The manipulation of the argument devicemac1 leads to a buffer overflow situation. This can potentially compromise the system or lead to data leakage, making it a significant concern for users and network administrators of these specific TOTOLINK router models.
The exploit has been publicly disclosed and is open to potential misuse, further raising the urgency for effective mitigation. The vulnerability has been assigned a CVSS Severity Score of 8.8, signifying its high impact and gravity.
Vulnerability Summary
CVE ID: CVE-2025-4730
Severity: Critical (8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The vulnerability exists due to improper input validation in the HTTP POST Request Handler. This allows an attacker to manipulate the ‘devicemac1’ argument, leading to a buffer overflow condition. Buffer overflow is a situation where an application stores more data in a buffer than it can hold, which can result in corruption of data, crash the application, or in severe cases, lead to code execution. In this case, a successful exploit could result in the attacker gaining unauthorized access to the system.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. Note that this code is purely illustrative and is not a working exploit.
POST /boafrm/formMapDel HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
devicemac1=00:11:22:33:44:55%00[Buffer overflow data]In this example, the attacker sends a POST request to the vulnerable endpoint, with the ‘devicemac1’ parameter manipulated to cause a buffer overflow.
It’s strongly recommended to apply the vendor patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against this critical vulnerability.