CVE-2023-45035Network attack vector

Authenticated code execution via unchecked buffer copy

Published Feb 2, 2024 · Updated Jun 17, 2025

Classic buffer overflow in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote authenticated users to execute code. QNAP has not identified the affected component or function; the published record states only that it copies input without checking its size. Administrator authentication is required, and successful exploitation executes attacker-controlled code through a network interface.

CVSS severity3.8
Low
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote authenticated users to execute code. QNAP has not identified the affected component or function; the published record states only that it copies input without checking its size. Administrator authentication is required, and successful exploitation executes attacker-controlled code through a network interface.

The record

CVE
CVE-2023-45035
Published
Feb 2, 2024
Updated
Jun 17, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-120, CAPEC-100, T1210
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=h5.1.x <h5.1.4.2596 build 20231128

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.1.x <h5.1.4.2596 build 20231128
Linn Products Limited · QuTScloudversion=c5.x.x <c5.1.5.2651
Linn Products Limited · QTSversion=5.1.x <5.1.4.2596 build 20231128

Published CVSS scores

3.8QNAP Systems Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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')
CAPEC-100Overflow Buffers
T1210Exploitation of Remote Services

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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