EUVD-2025-21237CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
A vulnerability classified as critical was found in Tenda FH451 1.0.0.9. Affected by this vulnerability is the function fromNatlimit of the file /goform/Natlimit of the component HTTP POST Request Handler. The manipulation of the argument page leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Analysis
CVE-2025-7506 is a critical stack-based buffer overflow vulnerability in Tenda FH451 router firmware version 1.0.0.9, exploitable via the HTTP POST parameter 'page' in the /goform/Natlimit endpoint. An authenticated remote attacker can achieve complete system compromise (code execution, data exfiltration, denial of service) without user interaction. Public exploit code is available, indicating active disclosure and likely exploitation in the wild.
Technical Context
The vulnerability exists in the HTTP POST request handler for the /goform/Natlimit component, specifically in the fromNatlimit function. The root cause is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a classic stack-based buffer overflow where user-supplied input in the 'page' parameter is copied to a fixed-size stack buffer without proper bounds checking. This affects the Tenda FH451 wireless router (CPE: cpe:2.3:o:tenda:fh451_firmware:1.0.0.9:*:*:*:*:*:*:*), a consumer-grade networking device. The HTTP POST interface suggests the vulnerability is in the device's web management interface, likely implemented in C/C++ without memory-safe bounds validation.
Affected Products
FH451
Remediation
Immediate actions: (1) Identify all Tenda FH451 devices running firmware 1.0.0.9 in your network; (2) Check Tenda's official support page for firmware updates (typically available at support.tenda.com.cn or your regional Tenda support site); (3) If patched firmware is available (versions post-1.0.0.9), upgrade immediately via the device's web interface (Administration > Firmware Upgrade); (4) If no patch exists, implement compensating controls: restrict HTTP/HTTPS management interface access to trusted IP ranges only, disable remote management features if not essential, change default/weak credentials to strong random passwords, and consider isolating affected devices to a separate network segment. (5) Monitor device logs for suspicious POST requests to /goform/Natlimit endpoint. Patch availability status requires checking Tenda's official advisory; organizations should contact Tenda support directly for confirmed patch timelines.
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External POC / Exploit Code
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