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QtsOperating system · Qnap

CVE-2025-30271

MEDIUM · 6.5 CVSS v3.1 Published 2025-08-29
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable 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 path traversal vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data. We have already fixed the vulnerability in the following versions: QTS 5.2.5.3145 build 20250526 and later QuTS hero h5.2.5.3138 build 20250519 and later

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 path traversal vulnerability in QNAP QTS and QuTS hero operating systems allows authenticated remote attackers to read arbitrary files outside the intended directory by manipulating file path inputs, potentially exposing sensitive system data.

MitigationUpdate QTS to version 5.2.5.3145 (build 20250526) or later, or QuTS hero to version h5.2.5.3138 (build 20250519) or later. Ensure user account security to prevent initial account compromise.

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:= 5.2.0.2737= 5.2.0.2744= 5.2.0.2782= 5.2.0.2802= 5.2.0.2823= 5.2.0.2851= 5.2.0.2860= 5.2.1.2930= 5.2.2.2950= 5.2.3.3006= 5.2.4.3070= 5.2.4.3079
Quts HeroOperating system
Affected:= h5.2.0.2737= h5.2.0.2782= h5.2.0.2789= h5.2.0.2802= h5.2.0.2823= h5.2.0.2851= h5.2.0.2860= h5.2.1.2929= h5.2.1.2940= h5.2.2.2952= h5.2.3.3006= h5.2.4.3070

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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 QNAP firmware version
    Log into the QNAP admin console and navigate to Control Panel > System > Firmware Update, or use the command 'getconf -s' via SSH to retrieve the firmware build version
    Affected if The firmware version matches any of the listed affected builds: 5.2.0.2737, 5.2.0.2744, 5.2.0.2782, 5.2.0.2802, 5.2.0.2823, 5.2.0.2851, 5.2.0.2860, 5.2.1.2930, 5.2.2.2950, 5.2.3.3006, 5.2.4.3070, 5.2.4.3079 for QTS, or h5.2.0.2737, h5.2.0.2782, h5.2.0.2789, h5.2.0.2802, h5.2.0.2823, h5.2.0.2851, h5.
  2. Confirm the operating system type
    In the QNAP admin dashboard, check whether the system is running QTS or QuTS hero by reviewing the system information page or login banner
    Affected if The system runs either QTS or QuTS hero with an affected version number
  3. Verify if remote administrative access is enabled
    Check Control Panel > System > General Settings > System Administration to see if QTS Web Server management is accessible remotely, or review firewall rules that permit external access to ports 8080 or 443
    Affected if Remote administrative access is enabled, allowing authenticated attackers to reach the vulnerable file handling functionality

A user is affected if their QNAP device runs QTS or QuTS hero with any of the specific build numbers listed in the affected versions and has remote administrative access enabled.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update QTS to version 5.2.5.3145 (build 20250526) or later, or QuTS hero to version h5.2.5.3138 (build 20250519) or later. Ensure user account security to prevent initial account compromise.

Recommended fix High confidence

QTS 5.2.5.3145 (build 20250526) or later / QuTS hero h5.2.5.3138 (build 20250519) or later

  1. 1. Identify current QTS or QuTS hero version by logging into the QNAP admin interface
  2. 2. For QTS systems: if running version 5.2.0.2737, 5.2.0.2744, 5.2.0.2782, or 5.2.0.2802, initiate upgrade to QTS 5.2.5.3145 build 20250526 or later
  3. 3. For QuTS hero systems: if running version h5.2.0.2737, h5.2.0.2782, h5.2.0.2789, or h5.2.0.2802, initiate upgrade to QuTS hero h5.2.5.3138 build 20250519 or later
  4. 4. Use QNAP's built-in Software Update feature or download the firmware from the official QNAP download center
  5. 5. Perform a backup of critical data before upgrading as a precautionary measure
  6. 6. After upgrade, verify the new version matches or exceeds the fixed build numbers
Caveat Standard QNAP OS upgrade risks apply; review release notes for any configuration or feature changes before proceeding

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

Fix this in Qts Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
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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-2025-30271 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
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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