What is the CVSS score of CVE-2026-3804?

CVE-2026-3804 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-2026-3804?

A high-severity vulnerability (CVSS 8.8) exists in Tenda i3 wireless devices that could allow unauthorized attackers to bypass MAC filtering controls, potentially enabling unauthorized network…

Is there a public PoC exploit available for CVE-2026-3804?

Yes, a public proof-of-concept exploit is available for CVE-2026-3804. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3804?

Within 24 hours: Inventory all Tenda i3 devices running version 1.0.0.6(2204) and assess network exposure; disable MAC filter feature if not critical to operations or isolate affected devices to trusted network segments only. Within 7 days: Restrict network access to device management interfaces using firewall rules; monitor for suspicious MAC filtering bypass attempts. Within 30 days: Contact Tenda for patch availability; prepare firmware upgrade plan; evaluate replacement with patched or alternative hardware if patch timeline is unacceptable.

I3 Firmware CVE-2026-3804

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 - 15:09 vuln.today

Public exploit code

CVE Published

Mar 09, 2026 - 06:16 nvd

HIGH 8.8

DescriptionCVE.org

A security flaw has been discovered in Tenda i3 1.0.0.6(2204). This vulnerability affects the function formWifiMacFilterSet of the file /goform/WifiMacFilterSet. The manipulation of the argument index results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

AnalysisAI

Remote code execution in Tenda i3 1.0.0.6(2204) firmware allows unauthenticated attackers to achieve full system compromise through a stack-based buffer overflow in the WifiMacFilterSet function. Public exploit code exists for this vulnerability, increasing the risk of active exploitation. No patch is currently available, requiring immediate mitigation through network segmentation or device isolation.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects I3 Firmware. A security flaw has been discovered in Tenda i3 1.0.0.6(2204). This vulnerability affects the function formWifiMacFilterSet of the file /goform/WifiMacFilterSet. The manipulation of the argument index results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

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.