CVE-2025-7854
Published: 19 July 2025
Summary
CVE-2025-7854 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 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 24.1% 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-2 (Flaw Remediation).
Deeper analysis
CVE-2025-7854 is a critical stack-based buffer overflow vulnerability in Tenda FH451 firmware version 1.0.0.9. The flaw affects the fromVirtualSer function in the /goform/VirtualSer file, where manipulation of the "page" argument triggers the overflow. Published on 2025-07-19, it 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) and maps to CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
An attacker with low privileges can exploit this remotely without user interaction. By sending a crafted request manipulating the "page" argument, they can trigger the buffer overflow, potentially achieving high impacts on confidentiality, integrity, and availability, such as arbitrary code execution on the device.
References point to a public proof-of-concept on GitHub (https://github.com/panda666-888/vuls/blob/main/tenda/fh451/fromVirtualSer.md and POC section) and VulDB entries (https://vuldb.com/?ctiid.316944, https://vuldb.com/?id.316944, https://vuldb.com/?submit.616366), confirming the exploit's disclosure to the public for potential use. No vendor patches or specific mitigation guidance are detailed in the provided sources.
The public availability of the exploit heightens risks for unpatched Tenda FH451 devices exposed to the internet.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-21977
Vulnerability details
A vulnerability classified as critical has been found in Tenda FH451 1.0.0.9. Affected is the function fromVirtualSer of the file /goform/VirtualSer. The manipulation of the argument page leads to stack-based buffer overflow. It is possible to launch the attack remotely.…
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The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the /goform/VirtualSer web endpoint of Tenda FH451 router allows remote exploitation of a public-facing application for potential code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the CVE by requiring identification, reporting, and correction of the stack-based buffer overflow flaw in Tenda FH451 firmware.
Prevents exploitation of the vulnerability by enforcing validation of the manipulable 'page' argument in the /goform/VirtualSer function.
Mitigates potential arbitrary code execution from the stack-based buffer overflow through memory safeguards like non-executable stacks.