Overview
A critical vulnerability, identified as CVE-2025-7550, has been discovered in Tenda’s FH1201 1.2.0.14(408) firmware. This vulnerability, if exploited, could potentially lead to a system compromise or data leakage. It resides in the function fromGstDhcpSetSer of the file /goform/GstDhcpSetSer and can be triggered remotely through the improper handling of the argument ‘dips. As Tenda routers are widely used, this vulnerability could potentially impact a large number of users and systems.
Vulnerability Summary
CVE ID: CVE-2025-7550
Severity: Critical (CVSS: 8.8)
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
Tenda FH1201 | 1.2.0.14(408)
How the Exploit Works
This vulnerability is a stack-based buffer overflow issue. It occurs when the fromGstDhcpSetSer function of the /goform/GstDhcpSetSer file in the Tenda FH1201 1.2.0.14(408) firmware fails to properly validate the length of user-supplied data before copying it to a fixed-length, stack-based buffer. This flaw could allow an attacker to overwrite the buffer’s content with arbitrary malicious data, potentially leading to the execution of unauthorized code or commands.
Conceptual Example Code
An attacker could exploit this vulnerability by sending a specially crafted HTTP request that contains an oversized ‘dips’ argument. Here’s a simplified, conceptual example of how such an HTTP request might look:
POST /goform/GstDhcpSetSer HTTP/1.1
Host: vulnerable-router
Content-Type: application/x-www-form-urlencoded
dips=<malicious_payload>In this example, “ would be a string that is long enough to overflow the stack-based buffer in the vulnerable function.
Mitigation and Prevention
Users are advised to apply the vendor-provided patch as soon as possible. If the patch cannot be applied immediately, users can protect themselves by deploying a web application firewall (WAF) or an intrusion detection system (IDS) that can detect and block attempts to exploit this vulnerability. However, these are only temporary measures and the ultimate solution is to apply the vendor’s patch.