CVE-2023-50361Network attack vector

Authenticated code execution via unchecked buffer copy

Published Apr 26, 2024 · Updated Aug 2, 2024

Buffer overflow in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote authenticated users to execute arbitrary code via a network. An undisclosed buffer-copy operation copies attacker-controlled input without checking its size, allowing the destination buffer to be overwritten. User-level access to a reachable NAS service is required; QNAP has not identified the affected component or published further code-level details.

CVSS severity5.0
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote authenticated users to execute arbitrary code via a network. An undisclosed buffer-copy operation copies attacker-controlled input without checking its size, allowing the destination buffer to be overwritten. User-level access to a reachable NAS service is required; QNAP has not identified the affected component or published further code-level details.

The record

CVE
CVE-2023-50361
Published
Apr 26, 2024
Updated
Aug 2, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-121, CWE-120, CAPEC-100
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=-
  2. Affected versionversion=h5.1.x <h5.1.6.2734 build 20240414

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=-; version=h5.1.x <h5.1.6.2734 build 20240414
Linn Products Limited · QTSversion=-; version=5.1.x <5.1.6.2722 build 20240402

Published CVSS scores

5.0QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC-100Overflow Buffers

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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