How severe is CVE-2026-3972?

CVE-2026-3972 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3972 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3972?

CVE-2026-3972 affects Tenda W3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3972?

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-2026-3972 have an EU (EUVD) identifier?

Yes. CVE-2026-3972 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11503.

When was CVE-2026-3972 published?

CVE-2026-3972 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-3972

CVE-2026-3972 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: 8.3
CVSS v4: 7.4
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11503
Weakness: CWE-787
Affected product: Tenda W3 Firmware
Published: 2026-03-12
Last modified: 2026-06-17

Description

A vulnerability was found in Tenda W3 1.0.0.3(2204). Affected by this issue is the function formSetCfm of the file /goform/setcfm of the component HTTP Handler. The manipulation of the argument funcpara1 results in stack-based buffer overflow. The attack can only be performed from the local network. The exploit has been made public and could be used.

Frequently asked questions

What is CVE-2026-3972?: A vulnerability was found in Tenda W3 1.0.0.3(2204). Affected by this issue is the function formSetCfm of the file /goform/setcfm of the component HTTP Handler. The manipulation of the argument funcpara1 results in stack-based buffer overflow. The attack can only be performed from the local network. The exploit has been made public and could be used.
How severe is CVE-2026-3972?: CVE-2026-3972 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3972 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3972?: CVE-2026-3972 affects Tenda W3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3972?: 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-2026-3972 have an EU (EUVD) identifier?: Yes. CVE-2026-3972 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11503.
When was CVE-2026-3972 published?: CVE-2026-3972 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-2026-4008 — High (CVSS 8.8): A flaw has been found in Tenda W3 1.0.0.3(2204). This issue affects some unknown processing of the file…
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…
CVE-2026-3976 — High (CVSS 8.8): A weakness has been identified in Tenda W3 1.0.0.3(2204). Impacted is the function formWifiMacFilterSet of the file…
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…

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