dbcve.org
QtsOperating system · Qnap

CVE-2025-52429

MEDIUM · 6.5 CVSS v3.1 Published 2025-10-03
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 use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory. We have already fixed the vulnerability in the following versions: QTS 5.2.6.3195 build 20250715 and later QuTS hero h5.2.6.3195 build 20250715 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 · moderate confidence

This is a format string vulnerability (CWE-134) in QNAP QTS and QuTS hero operating systems where external user input is used as a format string without proper sanitization. An attacker who first obtains administrator credentials can exploit this to read sensitive data from memory or modify memory contents, potentially leading to code execution or information disclosure.

MitigationApply the vendor-supplied firmware updates (QTS 5.2.6.3195 build 20250715 or QuTS hero h5.2.6.3195 build 20250715 and later). Prior to patching, ensure administrator accounts use strong, unique passwords and consider network segmentation to limit exposure.

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

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/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 web interface, go to Control Panel > System > Firmware, or run `getcfg System.Version` via SSH on the NAS
    Affected if The displayed version matches any of these: QTS 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 OR QuTS hero 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.
  2. Confirm the operating system type
    In the QNAP admin interface, check whether the device runs QTS or QuTS hero (this is visible on the dashboard or in System > Information)
    Affected if The device runs either QTS or QuTS hero and the version from step 1 is in the affected list for that OS type
  3. Verify if administrator access is possible
    Review user accounts with administrator privileges in Control Panel > Privilege > Users, or check if default admin account remains enabled
    Affected if Any administrator account exists on the system (the vulnerability requires an attacker to first obtain administrator credentials)

The system is affected if it runs QTS or QuTS hero with any version listed as affected AND has at least one administrator account configured.

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 5.2.6.3195 build 20250715 or QuTS hero h5.2.6.3195 build 20250715 and later). Prior to patching, ensure administrator accounts use strong, unique passwords and consider network segmentation to limit exposure.

Recommended fix High confidence

QTS 5.2.6.3195 build 20250715 or later / QuTS hero h5.2.6.3195 build 20250715 or later

  1. 1. Identify the current QTS or QuTS hero version by accessing the QNAP admin interface and navigating to Control Panel > System > Firmware Update
  2. 2. Compare the current version against the affected builds: QTS 5.2.0.2737, 5.2.0.2744, 5.2.0.2782, 5.2.0.2802 or QuTS hero h5.2.0.2737, h5.2.0.2782, h5.2.0.2789, h5.2.0.2802
  3. 3. If running an affected version, initiate a firmware update through the QNAP admin interface or manually download the update from QNAP's support page
  4. 4. Upgrade to QTS 5.2.6.3195 build 20250715 or later (for QTS systems) or QuTS hero h5.2.6.3195 build 20250715 or later (for QuTS hero systems)
  5. 5. After upgrade, verify the new firmware version is installed correctly and the system is operational
Caveat Standard QNAP firmware update considerations apply - ensure backups of critical data exist before updating, and review QNAP release notes for any known issues with the target version

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

Fix this in Qts Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
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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-2025-52429 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