dbcve.org
QtsOperating system · Qnap

CVE-2025-62852

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 version: QTS 5.2.8.3332 build 20251128 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

This is a buffer overflow vulnerability in QNAP QTS operating system that allows a remote attacker with existing administrator credentials to modify memory or crash processes. The attack requires prior authentication as an administrator, making it a privilege-escalation scenario on already-compromised accounts.

MitigationUpdate affected QNAP devices to QTS 5.2.8.3332 build 20251128 or later. Ensure administrator accounts use strong, unique passwords and consider network segmentation to limit exposure of management interfaces.

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
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 the QNAP operating system variant
    Log into the QNAP device admin console and check the System Information page, or run 'cat /etc/os-release' via SSH to determine if the system is running QTS or QTS Hero.
    Affected if The device is running QTS or QTS Hero (only these variants are affected by this CVE).
  2. Locate the installed QTS build version
    In the admin console, go to Control Panel > System > System Information > Firmware version. Alternatively, run 'getcfg System.Version.Build' via QCLI or check '/etc/config.def/VERSION' via SSH.
    Affected if The build number matches any of these: 2737, 2744, 2782, 2802, 2823, 2851, 2860, 2930, 2950, 3006, 3070, or 3079.
  3. Locate the installed QTS Hero build version
    In the admin console, go to Control Panel > System > System Information > Firmware version. Alternatively, run 'getcfg System.Version.Build' via QCLI or check '/etc/config.def/VERSION' via SSH.
    Affected if The build number matches any of these: 2737, 2782, 2789, 2802, 2823, 2851, 2860, 2929, 2940, 2952, 3006, or 3070 (prefixed with 'h' in version display).
  4. Verify administrative access exposure
    Review the list of administrator accounts in Control Panel > System > Admin Settings and check for any external or weak administrator credentials. Verify whether the management interface is exposed to untrusted networks.
    Affected if Administrator accounts exist with compromised or weak passwords, or the admin interface is accessible from the internet or untrusted networks.

A system is affected if it runs QTS or QTS Hero with any of the specific build numbers listed and an attacker could obtain valid administrator credentials to exploit the buffer overflow.

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 5.2.8.3332 build 20251128 or later. Ensure administrator accounts use strong, unique passwords and consider network segmentation to limit exposure of management interfaces.

Recommended fix High confidence

QTS 5.2.8.3332 build 20251128 or later

  1. Back up all critical data on the NAS before starting the upgrade process
  2. Log into QTS as administrator and navigate to Control Panel > System > Firmware Update
  3. Check the current firmware version under System Information to confirm the affected version is installed
  4. Either use 'Check for Update' to find QTS 5.2.8.3332 build 20251128 or later, or manually download the update from the QNAP download center
  5. Follow the on-screen prompts to install QTS 5.2.8.3332 build 20251128 or later
  6. After reboot, verify the new firmware version under System Information to confirm the update was successful
  7. Ensure the system is functioning normally before resuming normal operations

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
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,744.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2025-62852 — 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-2025-62852 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