CVE-2023-41277Network attack vector

Authenticated code execution via unchecked stack buffer copy

Published Feb 2, 2024 · Updated Jun 17, 2025

A stack buffer overflow in affected QNAP QTS, QuTS hero, and QuTScloud releases allows remote authenticated users to execute code. An undisclosed component copies attacker-controlled network input into a stack buffer without first validating its size. Administrator privileges are required; successful exploitation runs code on the NAS, while QNAP has not disclosed the affected function or request field.

CVSS severity5.5
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack buffer overflow in affected QNAP QTS, QuTS hero, and QuTScloud releases allows remote authenticated users to execute code. An undisclosed component copies attacker-controlled network input into a stack buffer without first validating its size. Administrator privileges are required; successful exploitation runs code on the NAS, while QNAP has not disclosed the affected function or request field.

The record

CVE
CVE-2023-41277
Published
Feb 2, 2024
Updated
Jun 17, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-120, CWE-121
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=h5.1.x <h5.1.2.2534 build 20230927

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.1.x <h5.1.2.2534 build 20230927
Linn Products Limited · QuTScloudversion=c5.x.x <c5.1.5.2651
Linn Products Limited · QTSversion=5.1.x <5.1.2.2533 build 20230926

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
5.5QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-121Stack-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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