How severe is CVE-2026-3804?

CVE-2026-3804 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3804 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3804?

CVE-2026-3804 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3804?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3804 have an EU (EUVD) identifier?

Yes. CVE-2026-3804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10298.

When was CVE-2026-3804 published?

CVE-2026-3804 was published on 2026-03-09 and last updated on 2026-06-17.

CVE-2026-3804

CVE-2026-3804 is a high-severity vulnerability in Tenda I3 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10298
Weakness: CWE-119
Affected product: Tenda I3 Firmware
Published: 2026-03-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-3804?: 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.
How severe is CVE-2026-3804?: CVE-2026-3804 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3804 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3804?: CVE-2026-3804 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3804?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3804 have an EU (EUVD) identifier?: Yes. CVE-2026-3804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10298.
When was CVE-2026-3804 published?: CVE-2026-3804 was published on 2026-03-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:i3_firmware:1.0.0.6\(2204\):*:*:*:*:*:*:*

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