How severe is CVE-2026-4008?

CVE-2026-4008 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-2026-4008 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-2026-4008?

CVE-2026-4008 affects Tenda W3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4008?

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-2026-4008 have an EU (EUVD) identifier?

Yes. CVE-2026-4008 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11540.

When was CVE-2026-4008 published?

CVE-2026-4008 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-4008

CVE-2026-4008 is a high-severity vulnerability in Tenda W3 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-2026-11540
Weakness: CWE-787
Affected product: Tenda W3 Firmware
Published: 2026-03-12
Last modified: 2026-06-17

Description

A flaw has been found in Tenda W3 1.0.0.3(2204). This issue affects some unknown processing of the file /goform/wifiSSIDset of the component POST Parameter Handler. Executing a manipulation of the argument index/GO can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.

Frequently asked questions

What is CVE-2026-4008?: A flaw has been found in Tenda W3 1.0.0.3(2204). This issue affects some unknown processing of the file /goform/wifiSSIDset of the component POST Parameter Handler. Executing a manipulation of the argument index/GO can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.
How severe is CVE-2026-4008?: CVE-2026-4008 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-2026-4008 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-2026-4008?: CVE-2026-4008 affects Tenda W3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4008?: 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-2026-4008 have an EU (EUVD) identifier?: Yes. CVE-2026-4008 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11540.
When was CVE-2026-4008 published?: CVE-2026-4008 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:w3_firmware:1.0.0.3\(2204\):*:*:*:*:*:*:*

More vulnerabilities in Tenda W3 Firmware

CVE-2026-4007 — High (CVSS 8.8): A vulnerability was detected in Tenda W3 1.0.0.3(2204). This vulnerability affects unknown code of the file…
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CVE-2026-3975 — High (CVSS 8.8): A security flaw has been discovered in Tenda W3 1.0.0.3(2204). This issue affects the function formWifiMacFilterGet of…
CVE-2026-3974 — High (CVSS 8.8): A vulnerability was identified in Tenda W3 1.0.0.3(2204). This vulnerability affects the function formexeCommand of the…
CVE-2026-3973 — High (CVSS 8.8): A vulnerability was determined in Tenda W3 1.0.0.3(2204). This affects the function formSetAutoPing of the file…
CVE-2026-3972 — High (CVSS 8.8): A vulnerability was found in Tenda W3 1.0.0.3(2204). Affected by this issue is the function formSetCfm of the file…

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