CVE-2024-21899

criticalpriority · attend · 48EPSS 0.244 · 98 %ileDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

24.4% (98th) EPSS

CVSS 9.8 · critical

Is it mine?

25 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An improper authentication vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QTS 4.5.4.2627 build 20231225 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTS hero h4.5.4.2626 build 20231225 and later QuTScloud c5.1.5.2651 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

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

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@qnapsecurity.com.twexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USCWE-287US

affected products (25)

Products and version ranges known to be affected.

QNAP NAS QuTScloud < 5.1.0.2498 build 20230822all versionscert_bundDE
QNAP NAS≤ QuTScloud < 5.1.0.2498 build 20230822cert_bundDE
QNAP Systems Inc. QTSall versionsenisa_euvdEU
QNAP Systems Inc. QTS4.5.x → 4.5.4.2627 build 20231225enisa_euvdEU
QNAP Systems Inc. QTS5.1.x → 5.1.3.2578 build 20231110enisa_euvdEU
QNAP Systems Inc. QuTS heroall versionsenisa_euvdEU
QNAP Systems Inc. QuTS heroh4.5.x → h4.5.4.2626 build 20231225enisa_euvdEU
QNAP Systems Inc. QuTS heroh5.1.x → h5.1.3.2578 build 20231110enisa_euvdEU
QNAP Systems Inc. QuTScloudall versionsenisa_euvdEU
QNAP Systems Inc. QuTScloudc5.x.x → c5.1.5.2651enisa_euvdEU
QNAP Systems, Inc. QTS4.5.0 → 4.5.4.2627 build 20231225fstec_bduRU
QNAP Systems, Inc. QTS5.1.0 → 5.1.3.2578 build 20231110fstec_bduRU
QNAP Systems, Inc. QuTS heroh4.5.0 → h4.5.4.2626 build 20231225fstec_bduRU
QNAP Systems, Inc. QuTS heroh5.1.0 → h5.1.3.2578 build 20231110fstec_bduRU
QNAP Systems, Inc. QuTScloudc5.0 → c5.1.5.2651fstec_bduRU
QNAP Systems, Inc. myQNAPcloud1.0.0 → 1.0.52fstec_bduRU
qnap qts< 4.5.4.2627nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.5.4.2627nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts5.1.0 → 5.1.3.2578nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 5.1.3.2578nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*

showing 20 of 25

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0589QNAP NAS: Mehrere SchwachstellenDeutsch2024-03-10csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in QNAP NAS ausnutzen, um einen Cross-Site-Scripting-Angriff zu starten, beliebigen Code auszuführen, Dateien zu manipulieren oder Sicherheitsmaßnahmen zu umgehen.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2024-03-08modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan