How severe is CVE-2026-3971?

CVE-2026-3971 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-2026-3971 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-2026-3971?

CVE-2026-3971 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3971?

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-2026-3971 have an EU (EUVD) identifier?

Yes. CVE-2026-3971 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11499.

When was CVE-2026-3971 published?

CVE-2026-3971 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-3971

CVE-2026-3971 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-787.

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-2026-11499
Weakness: CWE-787
Affected product: Tenda I3 Firmware
Published: 2026-03-12
Last modified: 2026-06-17

Description

A vulnerability has been found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset. The manipulation of the argument index/GO leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2026-3971?: A vulnerability has been found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset. The manipulation of the argument index/GO leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.
How severe is CVE-2026-3971?: CVE-2026-3971 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-2026-3971 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-2026-3971?: CVE-2026-3971 affects Tenda I3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3971?: 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-2026-3971 have an EU (EUVD) identifier?: Yes. CVE-2026-3971 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11499.
When was CVE-2026-3971 published?: CVE-2026-3971 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Tenda I3 Firmware

CVE-2026-3970 — High (CVSS 8.8): A flaw has been found in Tenda i3 1.0.0.6(2204). Affected is the function formwrlSSIDget of the file…
CVE-2026-3804 — High (CVSS 8.8): A security flaw has been discovered in Tenda i3 1.0.0.6(2204). This vulnerability affects the function…
CVE-2026-3803 — High (CVSS 8.8): A vulnerability was identified in Tenda i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file…
CVE-2026-3802 — High (CVSS 8.8): A vulnerability was determined in Tenda i3 1.0.0.6(2204). Affected by this issue is the function formexeCommand of the…
CVE-2026-3801 — High (CVSS 8.8): A vulnerability was found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formSetAutoPing of…
CVE-2026-3799 — High (CVSS 8.8): A flaw has been found in Tenda i3 1.0.0.6(2204). This impacts the function formSetCfm of the file /goform/setcfm. This…

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