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QtsOperating system · Qnap

CVE-2017-7876

CRITICAL · 10.0 CVSS v3.1 Published 2017-06-15
Fix available
A fix is available. Upgrade to after 4.2.6 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
This command injection vulnerability in QTS allows attackers to run arbitrary commands in the compromised application. QNAP have already fixed the issue in QTS 4.2.6 build 20170517, QTS 4.3.3.0174 build 20170503 and later versions.

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

Command injection vulnerability in QNAP QTS operating system that allows authenticated attackers to execute arbitrary commands on the underlying system. The vulnerability exists in the QTS web interface and can be exploited through specially crafted input parameters.

MitigationUpdate QTS firmware to version 4.2.6 build 20170517 or later for the 4.2 branch, or version 4.3.3.0174 build 20170503 or later for the 4.3 branch. Prioritize systems exposed to untrusted networks.

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:<= 4.2.6

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
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 QNAP QTS system
    Identify if the target system is running QNAP QTS. This can be done by checking the system banner, accessing the admin interface login page, or reviewing system documentation. QNAP devices typically expose port 8080 or 443 for the web interface.
    Affected if The system is not a QNAP QTS device, then this CVE does not apply.
  2. Check QTS firmware version
    Log into the QTS web interface as an administrator and navigate to Control Panel > System > System Status, or use the command 'grep -i version /etc/config/def_boot.conf' via SSH if available. The version number will be displayed (for example: 4.2.6, 4.3.0, etc.).
    Affected if The installed version is 4.2.6 or lower, or if it is a 4.3.x version lower than 4.3.3.0174, the system is potentially affected.
  3. Verify web interface is enabled
    Confirm that the QTS web administration interface is accessible. Check if ports 8080 (HTTP) or 443 (HTTPS) are open on the device using a port scanner or by attempting to access the login page remotely.
    Affected if The web interface is enabled and exposed, the command injection vulnerability can be exploited through specially crafted input parameters.
  4. Check authentication configuration
    Review the QTS authentication settings in Control Panel > System > Security to determine whether remote admin access is permitted and if strong passwords are enforced. Also verify if the default admin account is still in use.
    Affected if Remote authentication is allowed and valid credentials exist, an authenticated attacker could exploit the command injection flaw.

The system is affected by CVE-2017-7876 if it is a QNAP QTS device running version 4.2.6 or lower (or 4.3.x versions prior to 4.3.3.0174), has the web interface enabled, and allows remote administrative authentication.

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 4.2.6
Interim mitigation

Update QTS firmware to version 4.2.6 build 20170517 or later for the 4.2 branch, or version 4.3.3.0174 build 20170503 or later for the 4.3 branch. Prioritize systems exposed to untrusted networks.

Recommended fix High confidence

QTS 4.2.6 build 20170517 or QTS 4.3.3.0174 build 20170503 (or later)

  1. 1. Log into the QNAP NAS web interface as an administrator.
  2. 2. Navigate to Control Panel > System > Firmware Update.
  3. 3. Check the current QTS version under System Information to confirm the affected version is running.
  4. 4. If running QTS 4.2.6 or earlier, download and install QTS 4.2.6 build 20170517 or later.
  5. 5. If running QTS 4.3.x versions before 4.3.3.0174, download and install QTS 4.3.3.0174 build 20170503 or later.
  6. 6. Alternatively, use the 'Check for Update' feature to download the latest stable QTS version which contains the security patch.
  7. 7. After upgrade, verify the new QTS build version under System Information to confirm the patch was applied.
Caveat Major QTS version upgrades (e.g., 4.2 to 4.3) may introduce interface changes or require reinstallation of third-party applications; backup configuration before upgrading

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

Fix this in Qts Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2017-7876 in production — separate from our analysis above.

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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
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  • Version or environment caveats, and links to real fixes
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