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QtsOperating system · Qnap

CVE-2017-17030

CRITICAL · 9.8 CVSS v3.0 Published 2017-12-21
Fix available
A fix is available. Upgrade to after 4.3.3.0378 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
A buffer overflow vulnerability in login function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117, 4.3.4.0387 (Beta 2) build 20171116 and earlier could allow remote attackers to execute arbitrary code on NAS devices.

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

A buffer overflow vulnerability in the login authentication function of QNAP QTS firmware allows remote unauthenticated attackers to overflow a buffer in the login processing code, potentially executing arbitrary code with elevated privileges on the NAS device.

MitigationApply vendor-supplied QTS firmware patches from QNAP. If immediate patching is not feasible, restrict network access to the admin interface via firewall rules or VPN, and disable remote admin access if not required.

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
QtsOperating system
Affected:<= 4.3.3.0378= 4.3.4.0358= 4.3.4.0370= 4.3.4.0372= 4.3.4.0374= 4.3.4.0387

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:3.0/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. Confirm the device is running QNAP QTS
    Access the NAS admin interface or check system information via SSH if available. Look for QNAP-specific branding or run 'uname -a' to check the kernel/OS identification.
    Affected if The device is not a QNAP NAS running QTS firmware
  2. Determine the installed QTS firmware version
    Log into the QNAP admin web interface and navigate to Control Panel > System > System Status, or use the command 'cat /proc/version' via SSH to retrieve the firmware build number.
    Affected if Unable to determine the firmware version from the system
  3. Compare your firmware version against affected ranges
    Check if your version is <= 4.3.3.0378, or exactly 4.3.4.0358, 4.3.4.0370, 4.3.4.0372, 4.3.4.0374, or 4.3.4.0387. Note the specific build number from the System Status page.
    Affected if The installed version matches any of the affected versions listed in the CVE
  4. Verify remote admin access is enabled
    In the QTS admin interface, go to Control Panel > System > General Settings and check if 'Allow HTTP connection from external network' is enabled, or review your firewall/router port forwarding rules for port 8080 or 443 admin access.
    Affected if Remote admin interface is exposed to the internet or untrusted networks

You are affected if your QNAP NAS runs QTS firmware version matching the affected ranges and the admin login interface is accessible from external networks.

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 a release after 4.3.3.0378
Interim mitigation

Apply vendor-supplied QTS firmware patches from QNAP. If immediate patching is not feasible, restrict network access to the admin interface via firewall rules or VPN, and disable remote admin access if not required.

Recommended fix Moderate confidence

Latest stable QTS version (recommended: QTS 4.5.4 or later, as this vulnerability was addressed in subsequent security updates)

  1. 1. Log in to the QNAP NAS administrator interface.
  2. 2. Navigate to Control Panel > System > Firmware Update.
  3. 3. Click 'Check for Update' to identify the latest available QTS version.
  4. 4. If a newer version is available, select 'Update Now' to install the latest stable QTS firmware.
  5. 5. Alternatively, download the latest QTS firmware from the official QNAP website (https://www.qnap.com/en/support) and manually update via 'Manual Firmware Update' in the Control Panel.
  6. 6. After the update completes, verify the QTS version matches the latest stable release.
Caveat Review QNAP release notes for any feature changes or migration considerations before upgrading

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

Fix this in Qts Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
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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-2017-17030 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