What is the CVSS score of CVE-2026-3799?

CVE-2026-3799 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of I3 Firmware are affected by CVE-2026-3799?

A high-severity vulnerability (CVSS 8.8) has been discovered in Tenda i3 wireless routers affecting the configuration management function.

Is there a public PoC exploit available for CVE-2026-3799?

Yes, a public proof-of-concept exploit is available for CVE-2026-3799. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3799?

Within 24 hours: Identify and inventory all Tenda i3 1.0.0.6(2204) devices in your network and isolate them from critical systems. Within 7 days: Implement network-level compensating controls including WAF rules blocking access to /goform/setcfm, restrict administrative access to trusted IPs only, and disable remote management if not essential. Within 30 days: Evaluate device replacement options, contact Tenda for patch availability timeline, and develop a formal remediation plan with vendor coordination.

I3 Firmware CVE-2026-3799

HIGH

Buffer Overflow (CWE-119)

2026-03-09 cna@vuldb.com

Buffer Overflow Stack Overflow I3 Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:56 vuln.today

PoC Detected

Mar 09, 2026 - 16:14 vuln.today

Public exploit code

CVE Published

Mar 09, 2026 - 04:16 nvd

HIGH 8.8

DescriptionCVE.org

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 and may be used.

AnalysisAI

Stack overflow in Tenda i3 firmware version 1.0.0.6(2204) allows authenticated remote attackers to achieve full system compromise through a malformed funcpara1 parameter in the /goform/setcfm endpoint. Public exploit code exists for this vulnerability, and no patch is currently available. An attacker with network access and valid credentials can execute arbitrary code with full system privileges.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects I3 Firmware. 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 and may be used.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.