How severe is CVE-2026-4043?

CVE-2026-4043 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-2026-4043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4043?

CVE-2026-4043 affects Tenda I12 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4043?

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-2026-4043 have an EU (EUVD) identifier?

Yes. CVE-2026-4043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11591.

When was CVE-2026-4043 published?

CVE-2026-4043 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-4043

CVE-2026-4043 is a high-severity vulnerability in Tenda I12 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% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11591
Weakness: CWE-787
Affected product: Tenda I12 Firmware
Published: 2026-03-12
Last modified: 2026-06-17

Description

A security vulnerability has been detected in Tenda i12 1.0.0.6(2204). The impacted element is the function formwrlSSIDget of the file /goform/wifiSSIDget. Such manipulation of the argument index leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.

Frequently asked questions

What is CVE-2026-4043?: A security vulnerability has been detected in Tenda i12 1.0.0.6(2204). The impacted element is the function formwrlSSIDget of the file /goform/wifiSSIDget. Such manipulation of the argument index leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.
How severe is CVE-2026-4043?: CVE-2026-4043 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-2026-4043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4043?: CVE-2026-4043 affects Tenda I12 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4043?: 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-2026-4043 have an EU (EUVD) identifier?: Yes. CVE-2026-4043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11591.
When was CVE-2026-4043 published?: CVE-2026-4043 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:i12_firmware:1.0.0.6\(2204\):*:*:*:*:*:*:*

More vulnerabilities in Tenda I12 Firmware

CVE-2025-25678 — Critical (CVSS 9.8): Tenda i12 V1.0.0.10(3805) was discovered to contain a buffer overflow via the funcpara1 parameter in the formSetCfm…
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CVE-2026-5609 — High (CVSS 8.8): A flaw has been found in Tenda i12 1.0.0.11(3862). Affected by this vulnerability is the function formwrlSSIDset of the…
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CVE-2025-25679 — High (CVSS 8.0): Tenda i12 V1.0.0.10(3805) was discovered to contain a buffer overflow via the index parameter in the…

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