How severe is CVE-2026-3678?

CVE-2026-3678 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-2026-3678 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-2026-3678?

CVE-2026-3678 affects Tenda Fh451 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3678?

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-2026-3678 have an EU (EUVD) identifier?

Yes. CVE-2026-3678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10193.

When was CVE-2026-3678 published?

CVE-2026-3678 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-3678

CVE-2026-3678 is a high-severity vulnerability in Tenda Fh451 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% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10193
Weakness: CWE-119
Affected product: Tenda Fh451 Firmware
Published: 2026-03-07
Last modified: 2026-06-17

Description

A vulnerability was determined in Tenda FH451 1.0.0.9. Affected is the function sub_3C434 of the file /goform/AdvSetWan. This manipulation of the argument wanmode/PPPOEPassword causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

Frequently asked questions

What is CVE-2026-3678?: A vulnerability was determined in Tenda FH451 1.0.0.9. Affected is the function sub_3C434 of the file /goform/AdvSetWan. This manipulation of the argument wanmode/PPPOEPassword causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
How severe is CVE-2026-3678?: CVE-2026-3678 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-2026-3678 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-2026-3678?: CVE-2026-3678 affects Tenda Fh451 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3678?: 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-2026-3678 have an EU (EUVD) identifier?: Yes. CVE-2026-3678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10193.
When was CVE-2026-3678 published?: CVE-2026-3678 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:fh451_firmware:1.0.0.9:*:*:*:*:*:*:*

More vulnerabilities in Tenda Fh451 Firmware

CVE-2025-45513 — Critical (CVSS 9.8): Tenda FH451 V1.0.0.9 has a stack overflow vulnerability in the function.P2pListFilter.
CVE-2024-46048 — Critical (CVSS 9.8): Tenda FH451 v1.0.0.9 has a command injection vulnerability in the formexeCommand function i
CVE-2024-46046 — Critical (CVSS 9.8): Tenda FH451 v1.0.0.9 has a stack overflow vulnerability located in the RouteStatic function.
CVE-2026-4535 — High (CVSS 8.8): A vulnerability has been found in Tenda FH451 1.0.0.9. This vulnerability affects the function WrlclientSet of the file…
CVE-2026-4534 — High (CVSS 8.8): A flaw has been found in Tenda FH451 1.0.0.9. This affects the function formWrlExtraSet of the file…
CVE-2026-3677 — High (CVSS 8.8): A vulnerability was found in Tenda FH451 1.0.0.9. This impacts the function fromSetCfm of the file /goform/setcfm. The…

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