CVE-2025-7796
Published: 18 July 2025
Summary
CVE-2025-7796 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 31.7% 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 the stack-based buffer overflow by validating the bounds and format of the Username argument in the fromPptpUserAdd function.
Mitigates stack-based buffer overflows through memory protections like stack canaries, address space layout randomization, and non-executable memory.
Requires timely identification, reporting, and patching of flaws such as this critical buffer overflow in the Tenda FH451 firmware.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the Tenda FH451 router's web interface (/goform/PPTPDClient) via Username parameter enables remote exploitation of a public-facing application for likely remote code execution.
NVD Description
A vulnerability, which was classified as critical, was found in Tenda FH451 1.0.0.9. This affects the function fromPptpUserAdd of the file /goform/PPTPDClient. The manipulation of the argument Username leads to stack-based buffer overflow. It is possible to initiate the attack…
more
remotely. The exploit has been disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-7796 is a critical stack-based buffer overflow vulnerability affecting the Tenda FH451 router on firmware version 1.0.0.9. The flaw exists in the fromPptpUserAdd function within the /goform/PPTPDClient file, where manipulation of the Username argument triggers the overflow. It is associated with CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
The vulnerability carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating it can be exploited remotely over the network with low complexity by an attacker possessing low privileges. Successful exploitation enables high-impact outcomes, including unauthorized disclosure of confidential information, modification of system integrity, and disruption of availability, potentially leading to remote code execution.
References point to a GitHub repository by panda666-888 detailing the vulnerability and including a proof-of-concept exploit at https://github.com/panda666-888/vuls/blob/main/tenda/fh451/fromPptpUserAdd.md and https://github.com/panda666-888/vuls/blob/main/tenda/fh451/fromPptpUserAdd.md#poc. VulDB entries at https://vuldb.com/?ctiid.316857, https://vuldb.com/?id.316857, and https://vuldb.com/?submit.616345 provide further details. The exploit has been publicly disclosed and may be used in attacks; no specific patches or mitigations are outlined in the available information.
Details
- CWE(s)