CVE-2026-3801
Published: 09 March 2026
Summary
CVE-2026-3801 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda I3 Firmware. 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 45.7th percentile by exploit likelihood (below the median); 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-2026-3801 is a stack-based buffer overflow vulnerability affecting the Tenda i3 router on firmware version 1.0.0.6(2204). The flaw exists in the formSetAutoPing function processed by the /goform/setAutoPing endpoint, where manipulation of the ping1 or ping2 arguments triggers the overflow.
The vulnerability can be exploited remotely by attackers with low privileges, such as authenticated users, requiring low attack complexity and no user interaction. Exploitation over the network achieves high impacts on confidentiality, integrity, and availability, with 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). It is linked to CWE-119 and CWE-121.
Public exploits targeting the ping1 and ping2 overflow variants are available on GitHub repositories under Svigo-o/Tenda_vul. VulDB documents the issue with CTI ID 349768 and ID 349768, including a submission entry, but no vendor patches or specific mitigations are detailed in the references.
The exploit has been made public and could be used, indicating potential for active targeting of vulnerable Tenda i3 devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10292
Vulnerability details
A vulnerability was found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formSetAutoPing of the file /goform/setAutoPing. Performing a manipulation of the argument ping1/ping2 results in stack-based buffer overflow. The attack is possible to be carried out…
more
remotely. The exploit has been made public and could be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in router web endpoint (/goform/setAutoPing) enables remote code execution from low-privileged authenticated sessions, directly supporting T1190 (public-facing application exploitation) and T1068 (privilege escalation to achieve high CIA impact).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Timely flaw remediation through firmware patching directly eliminates the stack-based buffer overflow in the formSetAutoPing function.
Information input validation enforces bounds checking on ping1 and ping2 arguments to prevent the buffer overflow exploitation.
Memory protection mechanisms like stack canaries mitigate successful exploitation of the stack-based buffer overflow even if input validation fails.