CVE-2023-23363Network attack vector

Remote code execution via unchecked buffer copy

Published Sep 22, 2023 · Updated Sep 24, 2024

Buffer overflow in QNAP QTS 4.2.6, 4.3.3, 4.3.4, and 4.3.6 allows remote attackers to execute code via unspecified vectors. An unchecked buffer copy fails to verify the input length, but QNAP has not disclosed the affected component or input path. Network access without authentication is sufficient, but the vendor's high-complexity assessment indicates additional undisclosed conditions.

CVSS severity8.1
High
EPSS probability0.77%
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 4.2.6, 4.3.3, 4.3.4, and 4.3.6 allows remote attackers to execute code via unspecified vectors. An unchecked buffer copy fails to verify the input length, but QNAP has not disclosed the affected component or input path. Network access without authentication is sufficient, but the vendor's high-complexity assessment indicates additional undisclosed conditions.

The record

CVE
CVE-2023-23363
Published
Sep 22, 2023
Updated
Sep 24, 2024
Vendor
Linn Products Limited
Product
QTS
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=4.2.* <4.2.6 build 20230621
  2. Affected versionversion=4.3.* <4.3.3.2420 build 20230621
  3. Affected versionversion=4.3.* <4.3.4.2451 build 20230621
  4. Affected versionversion=4.3.* <4.3.6.2441 build 20230621

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QTSversion=4.2.* <4.2.6 build 20230621; version=4.3.* <4.3.3.2420 build 20230621; version=4.3.* <4.3.4.2451 build 20230621; version=4.3.* <4.3.6.2441 build 20230621

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1QNAP Systems, Inc.CVSS:3.1/AV:N/AC:H/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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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