CVE-2026-3799
Published: 09 March 2026
Summary
CVE-2026-3799 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 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 28.3th 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-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
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 or updates from the vendor.
Prevents exploitation by validating the funcpara1 argument in the /goform/setcfm endpoint to ensure it does not trigger the stack buffer overflow.
Provides defense-in-depth against stack-based buffer overflow exploitation via memory protections such as stack canaries, ASLR, and non-executable memory.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in exposed web management endpoint (/goform/setcfm) directly enables remote code execution from low-privileged network access, mapping to Exploitation for Privilege Escalation (T1068) and Exploit Public-Facing Application (T1190).
NVD Description
A flaw has been found in Tenda i3 1.0.0.6(2204). This impacts the function formSetCfm of the file /goform/setcfm. This manipulation of the argument funcpara1 causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been published…
more
and may be used.
Deeper analysisAI
CVE-2026-3799 is a stack-based buffer overflow vulnerability affecting the Tenda i3 router running firmware version 1.0.0.6(2204). The flaw resides in the formSetCfm function of the /goform/setcfm endpoint, where manipulation of the funcpara1 argument triggers the overflow. It is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
Remote exploitation is possible with low attack complexity over the network by an attacker possessing low privileges (PR:L), requiring no user interaction. Successful exploitation can result in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H), as indicated by the CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), potentially allowing arbitrary code execution and full device compromise.
An exploit has been publicly released on GitHub (https://github.com/Svigo-o/Tenda_vul/tree/main/tenda-i3-setcfm-funcpara1-buffer-overflow). Further details are documented on VulDB (https://vuldb.com/?ctiid.349766, https://vuldb.com/?id.349766, https://vuldb.com/?submit.768976). Practitioners should consult the vendor site (https://www.tenda.com.cn/) for mitigation guidance or firmware updates, as no specific patches are detailed in the available references.
Details
- CWE(s)