Overview
A critical vulnerability has been discovered in Tenda FH451 1.0.0.9, a widely-used networking device. This vulnerability, designated as CVE-2025-7794, lies within the fromNatStaticSetting function of the /goform/NatStaticSetting file. Exploitation of this flaw could lead to a stack-based buffer overflow, potentially enabling attackers to execute arbitrary code remotely or cause a denial of service. This vulnerability is of significant concern due to the potential for system compromise or data leakage, making it essential for users of the affected product to apply the appropriate mitigations as soon as possible.
Vulnerability Summary
CVE ID: CVE-2025-7794
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
Tenda FH451 | 1.0.0.9
How the Exploit Works
The exploit targets a flaw in the fromNatStaticSetting function of the file /goform/NatStaticSetting within Tenda FH451. Specifically, the vulnerability arises when handling the ‘page’ argument, which can be manipulated to cause a stack-based buffer overflow. This overflow, in turn, can be leveraged to execute arbitrary code or cause a denial of service. Given that the attack can be launched remotely and requires no user interaction or privileges, it poses a significant risk to unpatched systems.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability could potentially be exploited:
POST /goform/NatStaticSetting HTTP/1.1
Host: vulnerable-device-ip
Content-Type: application/x-www-form-urlencoded
page=%sIn this example, an attacker would substitute ‘%s’ with a large string of characters designed to overflow the buffer, potentially leading to arbitrary code execution.
Mitigation Guidance
Users of affected versions of Tenda FH451 are advised to apply the vendor-supplied patch immediately. In the absence of a patch, temporary mitigation can be achieved by employing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to block attempts to exploit this vulnerability. However, this is only a temporary solution, and users are strongly encouraged to apply the vendor patch as soon as it becomes available.