What is the CVSS score of CVE-2026-3802?

CVE-2026-3802 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-2026-3802?

A critical remote code execution vulnerability (CVE-2026-3802) affects Tenda i3 routers running firmware version 1.0.0.6(2204), with a CVSS score of 8.8 and active public exploits available.

Is there a public PoC exploit available for CVE-2026-3802?

Yes, a public proof-of-concept exploit is available for CVE-2026-3802. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3802?

Within 24 hours: Inventory all Tenda i3 devices in your environment and isolate affected units from critical network segments. Implement network access controls to restrict external access to device management interfaces. Within 7 days: Deploy compensating controls including WAF rules blocking access to /goform/exeCommand endpoint, disable the vulnerable exeCommand function if operationally feasible, and segment affected devices to a restricted VLAN with egress filtering. Within 30 days: Develop a device replacement plan for affected units, monitor vendor communications for patch availability, and conduct forensic review of device access logs for indicators of compromise.

I3 Firmware CVE-2026-3802

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 - 05:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was determined in Tenda i3 1.0.0.6(2204). Affected by this issue is the function formexeCommand of the file /goform/exeCommand. Executing a manipulation of the argument cmdinput can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.

AnalysisAI

Stack-based buffer overflow in Tenda i3 1.0.0.6(2204) firmware allows authenticated remote attackers to achieve code execution by manipulating the cmdinput parameter in the /goform/exeCommand function. Public exploit code exists for this vulnerability and no patch is currently available, placing affected devices at immediate risk.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects I3 Firmware. A vulnerability was determined in Tenda i3 1.0.0.6(2204). Affected by this issue is the function formexeCommand of the file /goform/exeCommand. Executing a manipulation of the argument cmdinput can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.

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.