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Quts HeroOperating system · Qnap

CVE-2025-53593

MEDIUM · 6.5 CVSS v3.1 Published 2026-01-02
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 an administrator account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.1.3250 build 20250912 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

A buffer overflow vulnerability in QNAP QTS and QuTS hero operating systems allows an authenticated remote attacker with administrator privileges to modify memory or crash processes. The attacker must first obtain valid administrator credentials before exploiting this memory corruption vulnerability.

MitigationApply the vendor-supplied patches: upgrade to QTS 5.2.7.3256 build 20250913, QuTS hero h5.2.7.3256 build 20250913, or QuTS hero h5.3.1.3250 build 20250912 or later. Since exploitation requires administrator access, enforce strong credential policies and limit administrative access to trusted 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
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
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

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
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/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. Identify QNAP OS version
    Log into the QNAP admin console and navigate to Control Panel > System > Firmware Update, or use the command 'cat /etc/config/firmware_version' via SSH to retrieve the installed QTS or QuTS hero version and build number
    Affected if The installed version matches any of the listed affected versions: QTS 5.2.0.2737 through 5.2.4.3079, or QuTS hero h5.2.0.2737 through h5.2.4.3070 (exact matches to the specific build numbers listed)
  2. Confirm QuTS hero vs QTS variant
    Check the operating system type: QuTS hero uses 'h5.x.x.x' version format while QTS uses '5.x.x.x' format without the 'h' prefix. This can be verified via the admin dashboard header or the same firmware version command
    Affected if Running QuTS hero with build numbers 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. Confirm QTS variant if applicable
    If running standard QTS, verify the exact build version matches one of the affected QTS 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, or 5.2.4.3079
    Affected if Running QTS with any of the exact build numbers listed in the affected versions
  4. Assess administrator access exposure
    Review user accounts with administrator privileges via Control Panel > Privilege > Users, and check remote access configurations (VPN settings, myQNAPcloud, port exposures) to determine if the device is accessible to untrusted networks
    Affected if Administrator accounts exist and the device management interface is reachable from networks beyond the trusted internal network, making credential theft or brute-force attacks plausible

The environment is affected if the QNAP device runs QTS or QuTS hero with any of the specific build versions listed and has administrator access that could be obtained by a remote attacker.

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 patches: upgrade to QTS 5.2.7.3256 build 20250913, QuTS hero h5.2.7.3256 build 20250913, or QuTS hero h5.3.1.3250 build 20250912 or later. Since exploitation requires administrator access, enforce strong credential policies and limit administrative access to trusted networks.

Recommended fix High confidence

QTS 5.2.7.3256 build 20250913 or later; QuTS hero h5.2.7.3256 build 20250913 or later; or QuTS hero h5.3.1.3250 build 20250912 or later

  1. Identify the current QTS or QuTS hero version running on the device via the web administration interface (System Settings > About)
  2. Determine the appropriate upgrade path based on the product: For QTS devices, upgrade to version 5.2.7.3256 build 20250913 or later; For QuTS hero devices, upgrade to either h5.2.7.3256 build 20250913 or later, or h5.3.1.3250 build 20250912 or later
  3. Backup all critical data and configurations from the NAS before proceeding with the upgrade
  4. Download the firmware update from the official QNAP download center at https://www.qnap.com/en/support
  5. Access the QNAP admin interface, navigate to Control Panel > System > Firmware Update, and install the downloaded firmware
  6. Restart the device if prompted and verify the new firmware version is installed correctly via System Settings > About
Caveat Standard firmware upgrade risks apply - ensure data is backed up before upgrading

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

Fix this in Quts Hero Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,580
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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-2025-53593 in production — separate from our analysis above.

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