CVE-2023-23363

criticalpriority · track · 39EPSS 0.009 · 60 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.92% (60th) EPSS

CVSS 9.8 · critical

Is it mine?

11 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

A buffer copy without checking size of input vulnerability has been reported to affect QNAP operating system. If exploited, the vulnerability possibly allows remote users to execute code via unspecified vectors. We have already fixed the vulnerability in the following versions: QTS 4.3.6.2441 build 20230621 and later QTS 4.3.3.2420 build 20230621 and later QTS 4.2.6 build 20230621 and later QTS 4.3.4.2451 build 20230621 and later

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@qnapsecurity.com.twexploitability 2.2 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimaryCWE-120US

affected products (11)

Products and version ranges known to be affected.

QNAP Systems Inc. QTS4.2.* → 4.2.6 build 20230621enisa_euvdEU
QNAP Systems Inc. QTS4.3.* → 4.3.3.2420 build 20230621enisa_euvdEU
QNAP Systems Inc. QTS4.3.* → 4.3.4.2451 build 20230621enisa_euvdEU
QNAP Systems Inc. QTS4.3.* → 4.3.6.2441 build 20230621enisa_euvdEU
QNAP Systems, Inc. QTS≤ 4.3.3.2420 build 20230621fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.2.6 build 20230621fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.3.4.2451 build 20230621fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.3.6.2441 build 20230621fstec_bduRU
qnap qts4.3.3 → 4.3.3.2420nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts4.3.4 → 4.3.4.245nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts4.3.6 → 4.3.6.2441nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2426QNAP NAS: Schwachstelle ermöglicht CodeausführungDeutsch2023-09-21csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle in QNAP NAS ausnutzen, um beliebigen Programmcode auszuführen.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd cert_bund NVD CVE.org MITRE

published 2023-09-22modified 2026-06-17

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+5664 more

references (4)

External citations — patches, advisories, analysis.

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