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QtsOperating system · Qnap

CVE-2025-30265

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 buffer overflow 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 modify memory or crash processes. 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 · moderate confidence

Buffer overflow vulnerability in QNAP QTS and QuTS hero operating systems allows an authenticated remote attacker to modify memory or crash processes. The attacker must first compromise a user account before exploiting this vulnerability.

MitigationUpdate affected QNAP devices to QTS 5.2.5.3145 (build 20250526) or QuTS hero h5.2.5.3138 (build 20250519) or later. Additionally, secure user accounts and implement strong authentication to prevent the initial account compromise required for exploitation.

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
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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. Identify QNAP firmware version
    Access the QNAP device admin console and navigate to Control Panel > System > Firmware Update, or use the QCLI command: 'getsysinfo' to retrieve the current firmware version and build number
    Affected if The displayed version matches any of the listed affected versions for QTS (5.2.0.2737 through 5.2.4.3079) or QuTS hero (h5.2.0.2737 through h5.2.4.3070)
  2. Confirm product type
    In the admin console, check the dashboard or System Information to confirm whether the device runs QTS or QuTS hero. QuTS hero versions are prefixed with 'h' (e.g., h5.2.0.2782)
    Affected if The product is QTS or QuTS hero and the version falls within the affected ranges
  3. Check remote management exposure
    Review network settings in Control Panel > System > General Settings > Network. Verify if the admin web interface (port 8080 or 443) or SSH (port 22) is accessible from external networks
    Affected if Remote admin interfaces are exposed to untrusted networks, increasing the attack surface for the required authentication prerequisite
  4. Audit user accounts
    Navigate to Control Panel > Privilege > Users to review all user accounts. Check for any unfamiliar accounts, changed passwords, or suspicious account modifications
    Affected if Any user account shows signs of compromise, as account compromise is a prerequisite for exploiting this vulnerability

The environment is affected if the device runs QTS or QuTS hero firmware versions matching the specific builds listed in the affected versions, particularly when remote admin access is exposed.

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 affected QNAP devices to QTS 5.2.5.3145 (build 20250526) or QuTS hero h5.2.5.3138 (build 20250519) or later. Additionally, secure user accounts and implement strong authentication to prevent the initial account compromise required for exploitation.

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 QNAP admin interface
  2. 2. Determine if the installed version is affected: QTS 5.2.0.2737, 5.2.0.2744, 5.2.0.2782, or 5.2.0.2802; or QuTS hero h5.2.0.2737, h5.2.0.2782, h5.2.0.2789, or h5.2.0.2802
  3. 3. Schedule a maintenance window for the upgrade
  4. 4. For QTS systems: upgrade to QTS 5.2.5.3145 build 20250526 or later
  5. 5. For QuTS hero systems: upgrade to QuTS hero h5.2.5.3138 build 20250519 or later
  6. 6. Perform backup of critical data before upgrading
  7. 7. Apply the firmware update via QNAP admin interface or QNAP Finder
  8. 8. After reboot, verify the new version is installed
Caveat Standard QNAP firmware upgrade risks apply - ensure backups and review app compatibility before upgrading

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

Fix this in Qts Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,440
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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-2025-30265 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data