How severe is CVE-2026-21411?

CVE-2026-21411 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-2026-21411 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21411?

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-2026-21411 have an EU (EUVD) identifier?

Yes. CVE-2026-21411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1070.

When was CVE-2026-21411 published?

CVE-2026-21411 was published on 2026-01-06 and last updated on 2026-06-17.

CVE-2026-21411

CVE-2026-21411 is a high-severity vulnerability 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-288.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1070
Weakness: CWE-288
Published: 2026-01-06
Last modified: 2026-06-17

Description

Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.

Frequently asked questions

What is CVE-2026-21411?: Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.
How severe is CVE-2026-21411?: CVE-2026-21411 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-2026-21411 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21411?: 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-2026-21411 have an EU (EUVD) identifier?: Yes. CVE-2026-21411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1070.
When was CVE-2026-21411 published?: CVE-2026-21411 was published on 2026-01-06 and last updated on 2026-06-17.

References

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