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CVE-2023-41273· NVD / CVE Program· CNA qnap

QTS, QuTS hero, QuTScloud

A heap-based buffer overflow 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

HighCVSS 7.2 · v3.1—No exploit No fix recorded
Published
Feb 2, 2024
Updated
Jun 17, 2026
EPSS
0.6% · 44th percentile
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Report tools

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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.2
CNA · qnap
5.5
1.7 point gap

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
qnapqts
qnapquts hero
qnapqutscloud

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • qnap qts5.1.0.2348
  • qnap qts5.1.0.2399
  • qnap qts5.1.0.2418
  • qnap qts5.1.0.2444
  • qnap qts5.1.0.2466
  • qnap qts5.1.1.2491
  • qnap qts5.1.2.2533
  • qnap quts heroh5.1.0.2409
  • qnap quts heroh5.1.0.2424
  • qnap quts heroh5.1.0.2453
  • qnap quts heroh5.1.0.2466
  • qnap quts heroh5.1.1.2488
  • qnap quts heroh5.1.2.2534
  • qnap qutscloudc5.1.0.2498

Versions reported by the vendor

Affected version ranges reported by the assigning authority (qnap). Independent of NVD's CPE analysis and usually ahead of it.

  • QNAP Systems Inc. QTS

    • 5.1.x and later · before 5.1.2.2533 build 20230926affected

  • QNAP Systems Inc. QuTS hero

    • h5.1.x and later · before h5.1.2.2534 build 20230927affected

  • QNAP Systems Inc. QuTScloud

    • c5.x.x and later · before c5.1.5.2651affected

Same product

qnap: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-2509Command Injection Vulnerability in QTS and QuTS heroKEV
    79This week
  • CVE-2018-19949If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands.KEV
    78This week
  • CVE-2019-7193This improper input validation vulnerability allows remote attackers to inject arbitrary code to the system.KEV
    73This week
  • CVE-2018-19953If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code.KEV
    63This week
  • CVE-2023-47218QTS, QuTS hero, QuTScloud
    60This week
  • CVE-2017-6360QNAP QTS before 4.2.4 Build 20170313 allows attackers to gain administrator privileges and obtain sensitive information via unspecified vect
    59Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-27130109 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
    46Plan
  • CVE-2023-23363133 days apartA buffer copy without checking size of input vulnerability has been reported to affect QNAP operating system.
    39Monitor
  • CVE-2023-5036184 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
    35Monitor
  • CVE-2023-5036284 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
    35Monitor
  • CVE-2023-5036484 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
    35Monitor
  • CVE-2024-27128109 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records