CVE-2025-7087
Published: 06 July 2025
Summary
CVE-2025-7087 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Belkin F9K1122 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 21.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A critical stack-based buffer overflow vulnerability, tracked as CVE-2025-7087, affects the Belkin F9K1122 router running firmware version 1.00.33. The flaw resides in the formL2TPSetup function within the /goform/formL2TPSetup endpoint of the webs component, where unsanitized input to the L2TPUserName argument can overflow a stack buffer. The issue is identified under CWE-119 and CWE-121.
The vulnerability can be exploited remotely by an attacker with low-level privileges and without user interaction, enabling full compromise of confidentiality, integrity, and availability on the device. Public proof-of-concept code has been released that demonstrates the buffer overflow, and the attack requires only network access to the management interface.
No vendor patch or official advisory has been issued; the manufacturer was notified prior to disclosure but provided no response. The public references consist of technical write-ups and exploit details hosted on GitHub and VulDB.
EPSS scores have remained flat at a low 0.0116 with no material increase since publication, indicating limited observed exploitation interest to date despite the availability of working proof-of-concept material.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-20146
Vulnerability details
A vulnerability classified as critical was found in Belkin F9K1122 1.00.33. Affected by this vulnerability is the function formL2TPSetup of the file /goform/formL2TPSetup of the component webs. The manipulation of the argument L2TPUserName leads to stack-based buffer overflow. The attack…
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can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes a remotely exploitable stack-based buffer overflow in the public-facing web interface (/goform/formL2TPSetup) of the Belkin F9K1122 router, enabling initial access via exploitation of a public-facing application.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.