Overview
The cybersecurity community has recently identified a critical vulnerability in Tenda FH451 devices up to version 1.0.0.9. This vulnerability, identified as CVE-2025-7434, exists within the POST Request Handler component, specifically within the fromAddressNat function of the /goform/addressNat file. The exploitation of this vulnerability could lead to a stack-based buffer overflow, potentially allowing an attacker to compromise the system or leak sensitive data. Given the severity of this vulnerability, it has become crucial for users of the affected devices to understand its implications and take immediate steps towards mitigation.
Vulnerability Summary
CVE ID: CVE-2025-7434
Severity: Critical, CVSS Score 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 FH451 | Up to 1.0.0.9
How the Exploit Works
The vulnerability originates from the manipulation of the ‘page’ argument in the fromAddressNat function of the /goform/addressNat file. This manipulation could lead to a stack-based buffer overflow, which could potentially allow an attacker to execute arbitrary code or crash the device, leading to a denial of service. The exploit is network-based, indicating that the attacker can launch the attack remotely without requiring any user interaction.
Conceptual Example Code
Here is a conceptual HTTP POST request example that an attacker might use to exploit the vulnerability:
POST /goform/addressNat HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=[Buffer-Overflow-Payload]The [Buffer-Overflow-Payload] in the above POST request represents a malicious input designed to overflow the stack buffer, leading to the potential execution of arbitrary code.
Mitigation
Users of the affected Tenda FH451 devices are strongly recommended to apply the vendor-supplied patch to mitigate the vulnerability. If a patch cannot be immediately applied, users may also consider implementing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can help identify and block attempts to exploit this vulnerability. Additionally, monitoring network traffic and logging any suspicious activity can provide early warning signs of a possible attack.