How severe is CVE-2026-6121?

CVE-2026-6121 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-2026-6121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6121?

CVE-2026-6121 affects Tenda F451 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6121?

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-2026-6121 have an EU (EUVD) identifier?

Yes. CVE-2026-6121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21720.

When was CVE-2026-6121 published?

CVE-2026-6121 was published on 2026-04-12 and last updated on 2026-06-17.

CVE-2026-6121

CVE-2026-6121 is a high-severity vulnerability in Tenda F451 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% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21720
Weakness: CWE-119
Affected product: Tenda F451 Firmware
Published: 2026-04-12
Last modified: 2026-06-17

Description

A flaw has been found in Tenda F451 1.0.0.7. Affected by this vulnerability is the function WrlclientSet of the file /goform/WrlclientSet of the component httpd. This manipulation of the argument GO causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been published and may be used.

Frequently asked questions

What is CVE-2026-6121?: A flaw has been found in Tenda F451 1.0.0.7. Affected by this vulnerability is the function WrlclientSet of the file /goform/WrlclientSet of the component httpd. This manipulation of the argument GO causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been published and may be used.
How severe is CVE-2026-6121?: CVE-2026-6121 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-2026-6121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6121?: CVE-2026-6121 affects Tenda F451 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6121?: 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-2026-6121 have an EU (EUVD) identifier?: Yes. CVE-2026-6121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21720.
When was CVE-2026-6121 published?: CVE-2026-6121 was published on 2026-04-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:f451_firmware:1.0.0.7:*:*:*:*:*:*:*

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CVE-2026-6136 — High (CVSS 8.8): A security vulnerability has been detected in Tenda F451 1.0.0.7_cn_svn7958. Impacted is the function frmL7ImForm of…
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CVE-2026-6133 — High (CVSS 8.8): A vulnerability was identified in Tenda F451 1.0.0.7_cn_svn7958. This affects the function fromSafeUrlFilter of the…
CVE-2026-6124 — High (CVSS 8.8): A vulnerability was determined in Tenda F451 1.0.0.7. This vulnerability affects the function fromSafeMacFilter of the…

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