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Missing AuthenticationWeakness · CWE-306

CVE-2026-3356

CRITICAL · 9.3 CVSS v4.0 Published 2026-03-31
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The MS27102A Remote Spectrum Monitor contains an inherent authentication bypass vulnerability due to having no mechanism to enable or configure authentication in its design. This allows any unauthorized user to access and manipulate the device's management interface without credentials, resulting in full administrative control.

MitigationImplement strict network isolation (air-gapping, VLAN segmentation, or firewall rules) to restrict access to trusted networks only, as the device cannot be configured to require authentication. Contact the vendor for firmware/hardware updates that may address this design flaw.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device model
    Access the device management interface or check device labeling/documentation to confirm the model is MS27102A Remote Spectrum Monitor
    Affected if The device is confirmed to be an MS27102A
  2. Verify management interface is reachable
    Attempt to access the device web interface or management service on its configured IP address using HTTP/HTTPS
    Affected if The management interface responds to connection attempts
  3. Confirm no authentication is enforced
    Access the management interface without providing any credentials - attempt to view configuration pages or device status without logging in
    Affected if Management pages load or device status is visible without any login prompt or credentials
  4. Check network accessibility of management interface
    Determine if the management interface is accessible from network segments that are not explicitly trusted (for example, from a DMZ, guest network, or the internet)
    Affected if The management interface is reachable from untrusted network segments without additional controls

If the device is an MS27102A and its management interface is accessible without providing credentials, the environment is affected by this vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement strict network isolation (air-gapping, VLAN segmentation, or firewall rules) to restrict access to trusted networks only, as the device cannot be configured to require authentication. Contact the vendor for firmware/hardware updates that may address this design flaw.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,800
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-3356 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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