How severe is CVE-2026-3356?

CVE-2026-3356 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2026-3356 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3356?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-3356 have an EU (EUVD) identifier?

Yes. CVE-2026-3356 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17585.

When was CVE-2026-3356 published?

CVE-2026-3356 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-3356

CVE-2026-3356 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-306.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17585
Weakness: CWE-306
Published: 2026-03-31
Last modified: 2026-06-17

Description

The MS27102A Remote Spectrum Monitor is vulnerable to an authentication bypass that allows unauthorized users to access and manipulate its management interface. Because the device provides no mechanism to enable or configure authentication, the issue is inherent to its design rather than a deployment error.

Frequently asked questions

What is CVE-2026-3356?: The MS27102A Remote Spectrum Monitor is vulnerable to an authentication bypass that allows unauthorized users to access and manipulate its management interface. Because the device provides no mechanism to enable or configure authentication, the issue is inherent to its design rather than a deployment error.
How severe is CVE-2026-3356?: CVE-2026-3356 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2026-3356 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3356?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-3356 have an EU (EUVD) identifier?: Yes. CVE-2026-3356 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17585.
When was CVE-2026-3356 published?: CVE-2026-3356 was published on 2026-03-31 and last updated on 2026-06-17.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-090-01

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