dbcve.org
QtsOperating system · Qnap

CVE-2025-30270

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 an authenticated remote attacker to read arbitrary files on the system by using directory traversal sequences (e.g., ../../../') in file path parameters. The vulnerability requires the attacker to first gain a valid user account before exploiting the path traversal to access sensitive files outside the intended directory.

MitigationApply the vendor-supplied firmware updates: QTS 5.2.5.3145 build 20250526 or later, and QuTS hero h5.2.5.3138 build 20250519 or later. Until patches can be applied, strictly control user account access and monitor for suspicious file access patterns.

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. Check QTS firmware version
    Log into the QNAP admin console, go to Control Panel > System > Firm Update, or use the command `cat /etc/config/def_boot` to view the firmware version
    Affected if Version matches 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, or 5.2.4.3079
  2. Check QuTS hero firmware version
    Log into the QuTS hero admin console, go to Control Panel > System > Firmware Update, or use the command `cat /etc/config/def_boot` to view the firmware version
    Affected if Version matches 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, or h5.2.4.3070
  3. Verify user account existence
    Check for active user accounts in Control Panel > Privilege > Users, or inspect the `/etc/passwd` file via SSH if enabled
    Affected if One or more user accounts exist on the system (the vulnerability requires a valid user account to exploit)
  4. Assess remote access exposure
    Review whether the QNAP management interface (ports 8080, 443) is exposed to untrusted networks, check firewall rules and VPN settings
    Affected if Management interface is accessible from the internet or untrusted networks without strict access controls

System is affected if running any of the listed QTS or QuTS hero versions AND has at least one user account, especially if the admin interface is externally accessible.

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

Apply the vendor-supplied firmware updates: QTS 5.2.5.3145 build 20250526 or later, and QuTS hero h5.2.5.3138 build 20250519 or later. Until patches can be applied, strictly control user account access and monitor for suspicious file access patterns.

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. Back up all critical data and configurations on the QNAP device before proceeding with the firmware upgrade.
  2. 2. Log in to the QNAP admin interface (QTS or QuTS hero depending on your device).
  3. 3. Navigate to Control Panel > System > Firmware Update.
  4. 4. Check for available updates and ensure the firmware version available is either QTS 5.2.5.3145 (build 20250526 or later) or QuTS hero h5.2.5.3138 (build 20250519 or later), depending on your device model.
  5. 5. If the required version is not available via the automatic update check, download the specific firmware version from the official QNAP download center at www.qnap.com.
  6. 6. Manually upload the firmware file via the 'Upload Firmware' option in the System > Firmware Update section.
  7. 7. Allow the firmware update process to complete fully without interrupting power to the device.
  8. 8. After the system restarts, verify the installed firmware version matches or exceeds the fixed versions (QTS 5.2.5.3145 / QuTS hero h5.2.5.3138).
Caveat Standard firmware upgrade risks apply - ensure data backup before proceeding; some configuration changes may be required after major version updates

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

Fix this in Qts Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,392.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2025-30270 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2025-30270 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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