CVE-2025-7805
Published: 18 July 2025
Summary
CVE-2025-7805 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 18.1% 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-16 (Memory Protection).
Deeper analysis
CVE-2025-7805 is a critical stack-based buffer overflow vulnerability affecting Tenda FH451 version 1.0.0.9. It resides in the fromPptpUserSetting function within the /goform/PPTPUserSetting endpoint and is triggered by improper handling of the delno argument, corresponding to CWE-119 and CWE-121.
The flaw can be exploited remotely by an authenticated attacker who supplies a crafted delno value, leading to arbitrary code execution or a denial of service with high impact on confidentiality, integrity, and availability. Public proof-of-concept code has been released, confirming the attack vector requires low attack complexity once valid credentials are obtained.
No official vendor advisory or patch information is referenced in the available sources. The EPSS score remains flat at 0.0157 with no observed rise after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-21933
Vulnerability details
A vulnerability classified as critical has been found in Tenda FH451 1.0.0.9. This affects the function fromPptpUserSetting of the file /goform/PPTPUserSetting. The manipulation of the argument delno leads to stack-based buffer overflow. It is possible to initiate 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?
The unauthenticated stack-based buffer overflow in the public-facing web management interface (/goform/PPTPUserSetting) of the Tenda FH451 router enables remote code execution, facilitating exploitation of public-facing applications for initial access.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the CVE by requiring timely remediation of the stack-based buffer overflow flaw through firmware patching.
Prevents remote exploitation by enforcing validation of the 'delno' argument at the /goform/PPTPUserSetting input point to avoid buffer overflows.
Protects against successful arbitrary code execution from the stack-based buffer overflow using memory safeguards like stack canaries and non-executable stacks.