How severe is CVE-2026-3803?

CVE-2026-3803 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-2026-3803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3803?

CVE-2026-3803 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3803?

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-2026-3803 have an EU (EUVD) identifier?

Yes. CVE-2026-3803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10297.

When was CVE-2026-3803 published?

CVE-2026-3803 was published on 2026-03-09 and last updated on 2026-06-17.

CVE-2026-3803

CVE-2026-3803 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% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10297
Weakness: CWE-119
Affected product: Tenda I3 Firmware
Published: 2026-03-09
Last modified: 2026-06-17

Description

A vulnerability was identified in Tenda i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. The manipulation of the argument index leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

Frequently asked questions

What is CVE-2026-3803?: A vulnerability was identified in Tenda i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. The manipulation of the argument index leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
How severe is CVE-2026-3803?: CVE-2026-3803 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-2026-3803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3803?: CVE-2026-3803 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3803?: 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-2026-3803 have an EU (EUVD) identifier?: Yes. CVE-2026-3803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10297.
When was CVE-2026-3803 published?: CVE-2026-3803 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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