CVE-2023-32975Network attack vector

Service interruption via unchecked buffer copy

Published Dec 8, 2023 · Updated May 27, 2025

Buffer overflow in QNAP QTS and QuTS hero 5.0.x and 5.1.x allows remote authenticated users to interrupt service via network requests. QNAP identifies an unchecked copy from an input buffer but has not disclosed the affected component, entry point, or destination-buffer boundary. Administrator privileges are required; QNAP's CVSS assessment limits the documented security consequence to availability, with no established data exposure or modification.

CVSS severity4.9
Medium
EPSS probability0.87%
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 and QuTS hero 5.0.x and 5.1.x allows remote authenticated users to interrupt service via network requests. QNAP identifies an unchecked copy from an input buffer but has not disclosed the affected component, entry point, or destination-buffer boundary. Administrator privileges are required; QNAP's CVSS assessment limits the documented security consequence to availability, with no established data exposure or modification.

The record

CVE
CVE-2023-32975
Published
Dec 8, 2023
Updated
May 27, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-120, CAPEC-100
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 8, 2023CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=h5.0.x <h5.0.1.2515 build 20230907
  2. 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=h5.0.x <h5.0.1.2515 build 20230907; version=h5.1.x <h5.1.2.2534 build 20230927
Linn Products Limited · QTSversion=5.0.x <5.0.1.2514 build 20230906; version=5.1.x <5.1.2.2533 build 20230926

Published CVSS scores

7.2NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.9QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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