CVE-2025-7506
Published: 12 July 2025
Summary
CVE-2025-7506 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Fh451 Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 24.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly prevents stack-based buffer overflows by enforcing input validation mechanisms on the 'page' argument in HTTP POST requests to /goform/Natlimit.
Mitigates exploitation of stack-based buffer overflows through memory protections such as stack canaries and address space layout randomization.
Requires identification and timely patching of critical firmware flaws like this buffer overflow in Tenda FH451 routers.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The stack-based buffer overflow in the router's public-facing HTTP POST handler (/goform/Natlimit) enables remote code execution via exploitation of a public-facing application.
NVD Description
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…
more
overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-7506 is a critical stack-based buffer overflow vulnerability affecting Tenda FH451 routers running firmware version 1.0.0.9. The flaw resides in the fromNatlimit function within the /goform/Natlimit file of the HTTP POST Request Handler component, where manipulation of the "page" argument triggers the overflow.
The vulnerability enables remote exploitation over the network with low complexity and requires low privileges, but no user interaction. Per its CVSS v3.1 score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), attackers can achieve high impacts on confidentiality, integrity, and availability, potentially leading to remote code execution or system crashes.
Exploit details, including a sample payload, have been publicly disclosed on GitHub at repositories like https://github.com/zezhifu1/cve_report/blob/main/FH451/fromNatlimit.md. Additional information is available via VulDB entries such as https://vuldb.com/?ctiid.316189 and https://vuldb.com/?id.316189. No vendor patches or mitigation guidance are detailed in the referenced sources.
Details
- CWE(s)