CVE-2026-6120
Published: 12 April 2026
Summary
CVE-2026-6120 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Com (inferred from references). Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 47.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-6120 is a stack-based buffer overflow vulnerability affecting the Tenda F451 router on firmware version 1.0.0.7. The flaw resides in the fromDhcpListClient function within the /goform/DhcpListClient file of the httpd component, where manipulation of the "page" argument triggers the overflow. Published on 2026-04-12, 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).
The vulnerability enables remote exploitation by attackers possessing low privileges, such as authenticated users on the network, with low attack complexity and no requirement for user interaction. Successful exploitation grants high-impact control over confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system compromise on the affected device.
Advisories and further details are available via references including https://github.com/Jimi-Lab/cve/issues/11, https://vuldb.com/submit/792864, https://vuldb.com/vuln/356983, https://vuldb.com/vuln/356983/cti, and the vendor site at https://www.tenda.com.cn/. The exploit is publicly available and may be used in attacks.
Notable context includes the public availability of an exploit, raising the risk of real-world exploitation against unpatched Tenda F451 devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-21718
Vulnerability details
A vulnerability was detected in Tenda F451 1.0.0.7. Affected is the function fromDhcpListClient of the file /goform/DhcpListClient of the component httpd. The manipulation of the argument page results in stack-based buffer overflow. The attack can be launched remotely. The exploit…
more
is now public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The stack-based buffer overflow in the router's httpd web interface (/goform/DhcpListClient) allows remote exploitation by low-privilege authenticated users to achieve arbitrary code execution and full system compromise, directly mapping to T1190 (Exploit Public-Facing Application) for the remote web vector and T1068 (Exploitation for Privilege Escalation) due to the PR:L to high-impact transition.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-2 requires timely identification, reporting, and patching of flaws like this stack-based buffer overflow in the httpd component, directly eliminating the vulnerability.
SI-10 mandates validation of inputs such as the 'page' argument at web form endpoints, preventing the buffer overflow triggered by malformed data.
SI-16 enforces memory protections like stack canaries or non-executable stacks, mitigating exploitation of the stack-based buffer overflow even if input validation fails.