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QtsOperating system · Qnap

CVE-2023-41275

HIGH · 7.2 CVSS v3.1 Published 2024-02-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
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 copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow authenticated administrators to execute code via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.2.2533 build 20230926 and later QuTS hero h5.1.2.2534 build 20230927 and later QuTScloud c5.1.5.2651 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 copy without checking size vulnerability in QNAP operating system allows authenticated administrators to execute arbitrary code via network. The flaw occurs in input handling where a buffer overflow can occur when copying data without proper size validation.

MitigationUpdate to fixed versions: QTS 5.1.2.2533+, QuTS hero h5.1.2.2534+, or QuTScloud c5.1.5.2651+. Restrict admin access and follow QNAP update procedures.

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:= 5.1.0.2348= 5.1.0.2399= 5.1.0.2418= 5.1.0.2444= 5.1.0.2466= 5.1.1.2491= 5.1.2.2533
Quts HeroOperating system
Affected:= h5.1.0.2409= h5.1.0.2424= h5.1.0.2453= h5.1.0.2466= h5.1.1.2488= h5.1.2.2534
QutscloudOperating system
Affected:= c5.1.0.2498

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
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/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 product type
    Log into the QNAP admin interface and check the system model and operating system type. Look for whether it runs QTS, QuTS Hero, or QuTScloud.
    Affected if The device is running QTS, QuTS Hero, or QuTScloud and the version matches the affected builds.
  2. Check QTS version
    In QTS, go to Control Panel > System > Firmware Update > Firmware Information, or run the command 'getsysinfo' via SSH to retrieve the build number.
    Affected if The build number equals 5.1.0.2348, 5.1.0.2399, 5.1.0.2418, 5.1.0.2444, 5.1.0.2466, 5.1.1.2491, or 5.1.2.2533.
  3. Check QuTS Hero version
    In QuTS Hero, go to Control Panel > System > Firmware Update > Firmware Information, or run the command 'getsysinfo' via SSH to retrieve the build number.
    Affected if The build number equals h5.1.0.2409, h5.1.0.2424, h5.1.0.2453, h5.1.0.2466, h5.1.1.2488, or h5.1.2.2534.
  4. Check QuTScloud version
    In QuTScloud, go to Control Panel > System > Firmware Update > Firmware Information, or run the command 'getsysinfo' via SSH to retrieve the build number.
    Affected if The build number equals c5.1.0.2498.
  5. Confirm admin access exposure
    Verify whether the QNAP admin web interface (port 8080 or 443) is exposed to the network or internet. Check firewall rules and port forwarding settings.
    Affected if The admin interface is accessible from untrusted networks and the version matches the affected builds listed.

You are affected if your QNAP device runs QTS, QuTS Hero, or QuTScloud with a build number matching one of the specific vulnerable versions listed.

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 to fixed versions: QTS 5.1.2.2533+, QuTS hero h5.1.2.2534+, or QuTScloud c5.1.5.2651+. Restrict admin access and follow QNAP update procedures.

Recommended fix High confidence

QTS 5.1.2.2533 or later / QuTS hero h5.1.2.2534 or later / QuTScloud c5.1.5.2651 or later

  1. Log in to the QNAP NAS administrator interface
  2. Navigate to Control Panel > System > Firmware Update
  3. Check current firmware version to confirm if running an affected version (QTS: 5.1.0.2348, 5.1.0.2399, 5.1.0.2418, or 5.1.0.2444 | QuTS hero: h5.1.0.2409, h5.1.0.2424, h5.1.0.2453, or h5.1.0.2466 | QuTScloud: c5.1.0.2498)
  4. If affected, back up all critical data according to QNAP best practices
  5. Perform firmware update to the fixed version: QTS 5.1.2.2533 (build 20230926) or later | QuTS hero h5.1.2.2534 (build 20230927) or later | QuTScloud c5.1.5.2651 or later
  6. Verify the update was successful by checking the firmware version after reboot
  7. Confirm the vulnerability is remediated

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-2023-41275 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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