CVE-2025-7551
Published: 14 July 2025
Summary
CVE-2025-7551 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Fh1201 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
A stack-based buffer overflow vulnerability exists in Tenda FH1201 firmware version 1.2.0.14(408). The flaw resides in the fromPptpUserAdd function within the /goform/PPTPDClient endpoint and is triggered by unsanitized input supplied to the modino/username argument. It is tracked as CVE-2025-7551, carries a CVSS 4.0 score of 7.4, and is associated with CWE-119 and CWE-121.
An authenticated remote attacker can send a specially crafted HTTP request to the affected endpoint and trigger the overflow, resulting in arbitrary code execution or denial of service with high impact to confidentiality, integrity, and availability. Public proof-of-concept code demonstrating the issue has already been released.
The EPSS score remains flat at 0.0157 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-21280
Vulnerability details
A vulnerability was found in Tenda FH1201 1.2.0.14(408). It has been declared as critical. Affected by this vulnerability is the function fromPptpUserAdd of the file /goform/PPTPDClient. The manipulation of the argument modino/username leads to stack-based buffer overflow. The attack can…
more
be launched remotely. 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 router's public-facing web management interface (/goform/PPTPDClient fromPptpUserAdd) via modino/username parameter enables remote exploitation of a public-facing application.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-2 mandates timely remediation of identified flaws like the stack-based buffer overflow in fromPptpUserAdd, directly eliminating the vulnerability through patching.
SI-10 requires validation of inputs such as modino and username arguments to block malformed data that triggers the buffer overflow.
SI-16 implements memory protections like stack canaries or ASLR to prevent arbitrary code execution even if the buffer overflow occurs.