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Virtual Desktop ServiceApplication · Netapp

CVE-2021-27007

CRITICAL · 9.8 CVSS v3.1 Published 2021-12-23
Fix available
A fix is available. Upgrade to 6.1.21356.1837 or later.
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
NetApp Virtual Desktop Service (VDS) when used with an HTML5 gateway is susceptible to a vulnerability which when successfully exploited could allow an unauthenticated attacker to takeover a Remote Desktop Session.

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 · moderate confidence

NetApp Virtual Desktop Service (VDS) with HTML5 gateway contains a critical vulnerability allowing unauthenticated attackers to hijack remote desktop sessions. The flaw enables complete session takeover without authentication, likely through remote code execution in the HTML5 gateway component.

MitigationApply NetApp security patches for CVE-2021-27007 immediately; if patches are unavailable, restrict network access to the HTML5 gateway or temporarily disable the service until remediation is possible.

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

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Virtual Desktop ServiceApplication
Affected:< 6.1.21356.1837

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
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 NetApp VDS installation
    Search for NetApp Virtual Desktop Service components on the system. Check installed programs, services, or documentation for 'NetApp VDS', 'Virtual Desktop Service', or 'HTML5 gateway' references.
    Affected if NetApp VDS or its HTML5 gateway component is present on the system
  2. Check VDS version number
    Locate the installed version of NetApp Virtual Desktop Service. This may be found in the application itself, in installed program details, or via the VDS management interface. Compare the version to 6.1.21356.1837.
    Affected if The installed version is lower than 6.1.21356.1837 (e.g., 6.1.x, 6.0.x, 5.x)
  3. Verify HTML5 gateway is enabled
    Check the VDS configuration to determine if the HTML5 gateway feature is enabled. This is typically configured in the VDS management console or configuration files.
    Affected if HTML5 gateway is enabled and accessible to users
  4. Assess network accessibility
    Determine if the HTML5 gateway is exposed to network access. Check firewall rules, reverse proxy configurations, or network ACLs that permit external or untrusted network access to the gateway port/URL.
    Affected if The HTML5 gateway is reachable from untrusted networks without additional authentication

If NetApp VDS is installed with a version lower than 6.1.21356.1837 and the HTML5 gateway is enabled and network-accessible, the environment is vulnerable to unauthenticated session hijack.

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.

dbcve · scoped
Upgrade available Upgrade to 6.1.21356.1837 or later
Fixed in 6.1.21356.1837
Interim mitigation

Apply NetApp security patches for CVE-2021-27007 immediately; if patches are unavailable, restrict network access to the HTML5 gateway or temporarily disable the service until remediation is possible.

Recommended fix High confidence

Virtual Desktop Service version 6.1.21356.1837 or later

  1. Log in to the NetApp Virtual Desktop Service management interface
  2. Navigate to the Virtual Desktop Service component or HTML5 gateway settings
  3. Locate the version information and verify the current version is below 6.1.21356.1837
  4. Initiate an upgrade to Virtual Desktop Service version 6.1.21356.1837 or later
  5. After upgrade completes, verify the new version number reflects 6.1.21356.1837 or higher
  6. Test the HTML5 gateway functionality to confirm the Remote Desktop sessions are operational

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Virtual Desktop Service Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.

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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-2021-27007 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data