High severity · published Jun 10, 2026
CVE-2025-66273
QTS, QuTS hero
7.2
CVSS
1.1%
EPSS
No
On KEV
Description
A command injection vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to execute arbitrary commands.
We have already fixed the vulnerability in the following versions:
QTS 5.2.9.3410 build 20260214 and later
QuTS hero h5.2.9.3410 build 20260214 and later
QuTS hero h5.3.4.3500 build 20260520 and later
QuTS hero h6.0.0.3397 build 20260206 and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QT
QTS · QNAP Systems Inc.
5.2.0 before 5.2.9.3410 build 20260214 · source: vendor, NVD
QH
QuTS hero · QNAP Systems Inc.
h5.2.0 before h5.2.9.3410 build 20260214; h5.3.0 before h5.3.4.3500 build 20260520; ? before h6.0.0.3397 build 20260206 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66273
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66273
Broken Link
https://www.qnap.com/en/security-advisory/qsa-26-10
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CVE-2020-2509
Command Injection Vulnerability in QTS and QuTS hero
9.8
CVE-2018-19949
QNAP NAS File Station Command Injection Vulnerability
6.1
CVE-2018-19953
QNAP NAS File Station Cross-Site Scripting Vulnerability
5.4
CVE-2018-19943
QNAP NAS File Station Cross-Site Scripting Vulnerability
9.8
CVE-2025-66276
QuTS hero is not affected
