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QtsOperating system · Qnap

CVE-2025-29882

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 NULL pointer dereference 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 launch a denial-of-service (DoS) attack. 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

A NULL pointer dereference vulnerability in QNAP QTS and QuTS hero operating systems allows an authenticated remote attacker to cause denial of service by exploiting the vulnerability after gaining a user account.

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 strong account credentials to prevent unauthorized access.

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 installed QTS version
    Log into QNAP admin console, navigate to Control Panel > System > Firmware > Firmware Status, or run `cat /proc/version` via SSH if enabled
    Affected if The displayed firmware version matches any of these: 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. Identify installed QuTS hero version
    Log into QuTS hero admin console, navigate to Control Panel > System > Firmware > Firmware Status, or check system information via SSH if enabled
    Affected if The displayed firmware version matches any of these: 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 remote administrative access is enabled
    Check if the QNAP web admin interface (port 8080 or 443) is accessible from external networks, or review firewall/port forwarding rules on the device
    Affected if The QTS or QuTS hero admin interface is reachable from outside the local network

The environment is affected if the device runs any QTS version from 5.2.0.2737 through 5.2.4.3079, or any QuTS hero version from h5.2.0.2737 through h5.2.4.3070, and the admin interface is accessible to an authenticated 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

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 strong account credentials to prevent unauthorized access.

Recommended fix High confidence

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

  1. 1. Identify your current QTS or QuTS hero version by accessing the QNAP admin interface and checking System Settings > About
  2. 2. Confirm your current version matches one of the affected versions: 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. Back up critical data and configuration settings before performing any firmware upgrade
  4. 4. Access the QNAP admin interface and navigate to Control Panel > System > Firmware Update
  5. 5. Select "Check for Update" and ensure the system updates to QTS version 5.2.5.3145 (build 20250526 or later) for QTS systems, or QuTS hero version h5.2.5.3138 (build 20250519 or later) for QuTS hero systems
  6. 6. Complete the upgrade process and verify the new version is installed correctly
Caveat Standard QNAP firmware upgrade precautions apply (backup data, ensure power stability during upgrade); no specific breaking changes mentioned in advisory

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
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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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-2025-29882 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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